Nova (1974–…): Season 42, Episode 11 - Chasing Pluto - full transcript
NOVA captures New Horizons' historic flyby of Pluto, the culmination of the spacecraft's nine-year, three-billion-mile journey to reveal the first ever detailed images of this strange, icy world at the very edge of our solar system.
Pluto, an icy dwarf planet
three billion miles from Earth
Our most powerful telescopes
see only a blur, until now
We have lift-off
A space probe called
New Horizons is on its way
This is an epic journey
To the far reaches
of our solar system
It's going farther
than any exploration
by human beings ever has
To capture images
of a mysterious world
that may hold the secret to the
origins of our solar system
Are there going to be surprises?
Absolutely
But not all the surprises
are good
About 1:55 p m local,
we've lost signal
with the spacecraft
Could it be we hit something?
But a last-minute rescue
saves the day
as Pluto comes into focus,
revealing a world stranger
than we ever imagined
Wow!
There's a heart on it!
"Chasing Pluto,"
right now on NOVA.
January 19, 2006
An Atlas 5 rocket,
a 212-foot powerhouse,
is prepped for launch
at Cape Canaveral
It was one of those days
where you say to yourself:
This is it
Project succeeds or fails today
Because when things go bad
on launch,
they usually go bad
in a spectacular way
T minus five, four,
three, two, one
We have ignition and liftoff
of NASA's New Horizons
spacecraft
on a voyage to visit
the planet Pluto and beyond
It's the fastest launch
ever recorded...
36,000 miles per hour
New Horizons needs
all the speed it can muster,
on a journey that will take it
clear across the solar system,
to attempt something unique
in the history of spaceflight:
get an up-close
and personal look at Pluto,
a mysterious, distant world
unlike anything
we've explored before
Back on Earth,
at the Johns Hopkins Applied
Physics Laboratory,
the mission operations team
for New Horizons
is not quite ready to celebrate
Once the rocket took off,
there was a great feeling of joy
and then you hold your breath
for a while
because you're not done
until you get the signal back
from the spacecraft
that everything's okay
We don't have a mission
until we know that spacecraft
is communicating with us
And so they wait
Everything is a concern
Things we've thought about
we know we've solved
To try and anticipate
so many eventualities,
it's the challenge
of spaceflight
Almost an hour passes
And then, Mission Ops receives
the first signal
from New Horizons.
Scientists turn
to each other and go,
"I love you, man!"
It was an astonishingly
happy time
And that's the greatest feeling,
because now we know we have
a mission to Pluto
This is just the first
of many challenges to come
on a journey that will take
almost a decade
Just nine hours
after leaving the launch pad,
it was already crossing
the orbit of the moon
A trip that took
Apollo astronauts three days
But even traveling tens
of thousands of miles an hour,
it will take over nine years
for New Horizons
to reach its destination,
to explore the far reaches
of our solar system, more than
three billion miles from Earth
Beyond the planets
we've come to know
Mars with its rocky red surface,
the gas giant Jupiter
with its raging storm,
and Saturn
with its stunning rings
Uranus, where turbulent winds
blow over 500 miles an hour,
and Neptune, a planet
so far from the Sun,
it takes 165 years
to complete just one orbit
Finally New Horizons
will arrive at Pluto,
a world we can only picture
with the help of artwork
like this, at least for now
Who can tell us more
about the planets?
Back in the 1950s,
every grade schooler
was taught there were
nine planets,
Pluto being the last
and loneliest
Everybody loved Pluto because
it was this funny oddball
sitting out there
at the very edge
You don't find that kind
of name recognition
and emotional connection
and interest level for Uranus,
or Mercury,
or going down the list,
but somehow Pluto just naturally
attracts people's attention
What makes Pluto so popular?
It may have something to do
with a playful bloodhound
named Pluto the pup
It turns out the Disney
character made its debut
around the same time the planet
was discovered
Over the years we've gotten
to know this beloved little pup
The same can't be said for this
mysterious little world
The truth is,
Pluto and its moons
have only been observed
from billions of miles away
Our best images,
nothing more than a blur
In fact, one of the biggest,
baddest space telescopes
in our arsenal, the Hubble,
which takes stunning images
of enormous distant galaxies,
can only capture these pixelated
images of Pluto,
because not only is it
far away, it's really small
But even at this resolution,
they suggest
something intriguing
Using these precious pixels,
a computer-generated image
reveals Pluto has
a surprisingly varied surface
The light areas
could be miles and miles of ice
The ices are the most
obvious signature that you see,
but you can discern that there's
other components there as well
We just don't know exactly
what they're made of
But here's what we do know:
one of the few planets
in the solar system
with such a varied surface
is planet Earth
We also know that Pluto has
a rather bizarre atmosphere
During its 248-year orbit,
as Pluto gets closer to the Sun,
its frozen surface starts
to thaw
and its atmosphere
slowly emerges
What we see in the atmosphere
is gases that are coming
off the surface,
creating a temporary
atmosphere, perhaps
Pluto has a unique type
of atmosphere
in this outer part
of the solar system
that we've never studied before
An area so distant and elusive
we knew almost nothing about it
until the 1990s,
when powerful new telescopes
discovered lonely little Pluto
wasn't so lonely after all
It's part of a region
in the outer solar system
beyond the orbit of Neptune
called the Kuiper Belt
And it is enormous
Billions of miles from the Sun,
the Kuiper Belt is filled
with hundreds of thousands
of icy objects
While they may look
like asteroids,
which are made of rock
and metal,
these objects, hidden in the
solar system's deep freeze,
are made of a mixture
of rock and ice
These are basically
frozen remnants
of the early part
of the solar system
that are still in the freezer
You can start to read
this fossil record
of how the solar system evolved
by looking at these objects
You can't say
for the New Horizons mission,
"Been there, done that,"
because it hasn't
We've already explored
the terrestrial planet region,
the giant planet region
Now we're exploring
a completely new portion
of the solar system
that's never been touched before
We don't know what we're going
to find, we really don't
And I think that that's what
really makes this so exciting
How do you design a spacecraft
that can survive
a three-billion-mile journey
to parts unknown?
Any time you explore
something new,
there's always a little risk
The New Horizons mission
faced a huge number
of challenges
We're going to the outskirts
of the solar system, you know,
30 times farther
from the Sun than the Earth
And so in order to get there
in a reasonable amount of time
we had to build the lightest
possible spacecraft
that we could,
put it on the largest rocket
we could
There was no opportunity
to fly big solar arrays
because the sunlight
is just too faint,
so we carry
a nuclear-powered source
We have a suite of instruments,
seven instruments
to do very different things
And they weigh less than about
70 pounds, all of them together
Seven scientific instruments
not much bigger
than a grand piano
with whimsical names
like Pepsi, Swap,
and an antenna named Rex
Two are named
after the lead characters
in the 1950s television show
The Honeymooners,
Ralph and Alice
All of these instruments
will analyze Pluto's surface
and geology, and reveal secrets
about its mysterious atmosphere
Back in the 1980s,
one of the best ways
to observe Pluto's atmosphere
was with this,
a C-141 cargo plane
with a makeshift observatory
on its side
The Kuiper Airborne Observatory
was not what you'd call
a first-class ride
The Kuiper Airborne Observatory
is not built for comfort
You're on headsets
the whole time
It's very loud, it's very cold
The telescope, it's
in the middle of an airplane
It bounces around
But by flying a telescope
above the weather,
they had a chance
to capture a rare event
called a stellar occultation
During this event,
an object, like Pluto,
passes in front of a bright star
blocking its light
If the object has an atmosphere,
the light gradually fades out,
then slowly fades back up again
But if it doesn't,
the light abruptly disappears,
and then quickly reappears
This is a recording
of what happened
onboard the Kuiper
Airborne Observatory
the night of June 9, 1988,
when a group of researchers
were determined to find out
if Pluto has an atmosphere
The light behind Pluto
slowly faded,
and the crew made history
I was fortunate enough
to be involved
I would call that the beginning
of my being an astronomer,
and it's a pretty good beginning
One of the instruments
onboard New Horizons
that's designed to study Pluto's
elusive atmosphere is Alice
This model is an actual size
model of Alice
Alice is an ultraviolet
spectrometer
It's a telescope that breaks up
light into a rainbow
Every chemical element
reflects and absorbs light
in a unique way,
creating a pattern
as distinct as a fingerprint
Hydrogen's fingerprint
looks like this,
while nitrogen's looks like this
Powerful Earth-based telescopes
have already detected molecules
of nitrogen, methane and carbon
monoxide on Pluto's surface
and in its atmosphere
We suspect it has
a number of others that we
simply can't detect
As the spacecraft flies
just a few thousand miles
above Pluto, Alice will search
for those fingerprints
Then, at the end of the flyby,
the spacecraft will turn around
to give Alice a one-of-a-kind
view of Pluto's atmosphere,
as seen through the light
of the Sun
We can use the Sun
as our light source
to probe the atmosphere
and look for those fingerprints
of certain types
of atoms and molecules
While Alice probes
Pluto's atmosphere,
her partner, Ralph,
an infrared spectrometer,
will be hard at work searching
for those chemical fingerprints
of molecules on Pluto's surface
We want to know what's causing
the very bright surfaces
on Pluto, which we think
is exotic snowflakes of
molecular nitrogen and methane
But there are other regions
that seem to be devoid
of those snowflakes
and are probably much redder,
darker hydrocarbon deposits
Ralph will finally reveal
what these strange,
dark regions are made of
But to get up-close
and personal images of Pluto
requires an instrument with
a one-of-a-kind telephoto lens
The largest imager on board
New Horizons, named LORRI,
will capture extraordinary
images of Pluto's surface
LORRI will take pictures
so detailed
that if it was flying
over New York City,
you could see the Hudson River,
the East River,
even Central Park
To put this in perspective,
this image of the Big Apple
was taken by a satellite
traveling about 400 miles
above Earth
LORRI is so powerful,
it could capture
the same amount of detail
from more than 7,000 miles
above Earth
But sending a telescope
with a lens like this
into the grueling subzero
temperatures of the Kuiper Belt
is risky business
When you have a telescope,
it's opened to space,
and so it's cooling
through that opening
The result is that you're
putting part of camera cold,
part of it warm,
and that changes
the shape of the telescope
and that tends to put it
out of focus
And you can end up with pictures
that look like this
To solve this problem
they turn to a material
found in bulletproof vests
What makes vests
like this so strong
is a compound
called silicon carbide
LORRI is made out of
a special version of it
which is able to tolerate
temperature gradients
without distorting its shape
But it's also very strong
and very light
There's a lot of things
that might go wrong,
and we've tried to anticipate
all those things
and work out contingency plans,
and contingency plans
for those contingency plans
We've been working for years
to get the spacecraft ready,
prepare for everything
you could think of
In the end, it just
You know, you just have
to sit there and wait,
and it just either works
or it doesn't
For the New Horizons team,
waiting to find out
if all their hard work
will pay off
just may be the toughest
challenge of all
During the Pluto encounter,
the spacecraft's
basically pre-programmed
to do everything on its own
If it gets into trouble,
we can't help
We can't give it a call and say,
"Whoops, you're looking
at the wrong thing
Adjust your sights
a little bit to the left"
That's because when
the spacecraft flies by Pluto,
it will take
four-and-a-half hours
for a radio signal
to reach Earth
and another
four-and-a-half hours
for instructions
to get back to the spacecraft
If something went wrong,
it would be more than nine hours
before we could tell it
to do something
The most important science
is happening really only
over about a 12-hour period
The timing has to be precise
because the onboard commands
all have a predetermined time
that this is supposed to happen
If that time changes too much,
we'll get a lot of pictures
of black space
and we'll miss the science
February 28, 2007
New Horizons has been en route
for a little over a year
Back at mission operations
at the Johns Hopkins
Applied Physics Laboratory,
the team prepares
for the spacecraft's
first real test since launch
As New Horizons nears Jupiter,
it must hit a mark
just 500 miles wide,
where it will get pulled
into the gas giant's gravity
and get flung out
At that point, it will be
traveling a lot faster
Think of it like a clever
maneuver used in roller derby
called "the whip"
One skater pulls another,
propelling her forward
with greater velocity
That's what Jupiter's gravity
will hopefully do
for New Horizons.
At mission operations,
the tension is palpable,
especially for the mission
operations manager,
Alice Bowman,
also known as "MOM"
Status check
She has spent years
preparing for this moment,
and she knows all too well
what it means
if this maneuver should fail
It would take years longer
to get to Pluto
if you did not have that flyby
If you think nine years
is a long time,
adding another couple years
onto that,
that would have been intolerable
The clock is ticking
MOM, along with
the Mission Ops team,
waits to receive telemetry
from the spacecraft
This data will reveal
whether New Horizons
successfully pulled off
the gravity assist or not
Red is bad, green is good,
gray means you don't have
any data
Finally, they hear
from the spacecraft
PI, this is MOM on Pluto One
Spacecraft telemetry
for all subsystems is nominal
Spacecraft is outward bound
from Jupiter
and we're on our way to Pluto
So far, so great
This is good
By stealing some momentum
from Jupiter
along the way to Pluto,
we can actually increase
the speed of the spacecraft
by about 20% and cut three years
off the travel time
And at the same time,
because in order to do
the Jupiter flyby
you end up coming
fairly close to it,
it gives you an opportunity
to do some great science
It was the only time we were
going to have large objects
for the cameras
to actually point to and say,
"Okay, are we doing this right?"
We used all the instruments
on New Horizons,
but LORRI was prominent
Okay, thar she blows
Oh, wow!
Look at that!
And we got both of them,
we got both of them
It's beautiful!
From more than
a million miles away,
LORRI captures a sequence
of images
of the eruption of a volcano
on Jupiter's moon Io
It was the first time
that a time-lapse
had ever been made
of any volcano anywhere
in the universe off the Earth
So it was really unique
It's another plume!
Perfect image
Yeah!
We were extremely lucky
we got these fantastic movies
It made all those sleepless
nights and all that hard work
very much worth it
After the gravity assist,
New Horizons
goes into hibernation
Only essential systems
are up and running
This limits the amount of wear
and tear on the equipment
For most of its nine-year
journey, it will be asleep,
but once a week, the spacecraft
phones home to MOM
This is MOM on Pluto One,
status check
And MOM lets the whole team know
if all systems
are in working order
As New Horizons makes its way
across the solar system
to the last and loneliest planet
to be explored,
back on Earth, a revolution
in astronomy is taking place
After 75 years as the solar
system's ninth planet,
Pluto is getting
its walking papers
Pluto was, since 1930, a planet
He had stature, he had friends
Could it be the final indignity
for the farthest and smallest
planet in our solar system?
♪ Rock on, Pluto, you'll always
be a planet to me ♪
Size doesn't matter!
The public takes to the streets
to fight for Pluto
Go, Pluto!
Pluto forever!
It's been America's
favorite planet
since it was discovered
back in the 1930s
by the unlikeliest
of planet hunters
Clyde Tombaugh was
a self-educated farm boy
who attended
a one-room schoolhouse
His first job in astronomy
included cleaning telescopes
and sweeping up
at the Lowell Observatory
He spent the rest of his time
searching for something
that could be causing
disturbances in Neptune's orbit:
the mysterious "Planet X"
Every few nights,
he placed a photosensitive
glass plate on the telescope,
securing it
so it would not shift
Then he exposed the plate
for one hour
to the universe
During that time, the motorized
telescope slowly moved
to compensate
for Earth's rotation
Several days later,
he'd retrace his steps,
taking pictures
of the same sections of the sky
he had photographed earlier
Then, using an ingenious device
called a blink comparator,
Clyde aligned the two images
to carefully examine
their differences
The blink comparator enabled him
to shift back and forth,
searching for the subtlest
of changes
Although the human eye is good
at spotting differences,
finding a dim celestial object
billions of miles away
was a daunting task
Month after month,
he forged ahead
through a harsh, cold winter
He almost froze to death
one night because his fingers
got so numb,
he couldn't get
the trap door open
to get out of the dome
They were having
a lot of problems
with the photographic plates
breaking in the cold weather,
and he invented
a new plate holder
that would keep the plates
from breaking,
and that's what led
to the discovery
After patiently searching
for almost a year,
a determined Clyde
finally found a tiny dot
slowly moving
across the night sky
Can you see it?
Here it is
Two months later,
the Lowell Observatory
proudly announced that
a young assistant
had discovered the ninth planet
in our solar system
Because of the discovery,
my dad got his college education
Otherwise, he probably
would not have been able
to afford to go to college
The discovery was, I would say,
the driver of our life
in many ways
After discovering Pluto,
Clyde taught astronomy,
and for decades to come,
he searched for another planet
in the far reaches
of the solar system
But as hard as he
and other astronomers looked...
And they looked hard...
Nobody found anything
Until astronomers David Jewitt
and Jane Luu
took on the challenge
They started a search
that would take a lot longer
than they could ever imagine
Why did it take so long?
It was a matter of technology
catching up with the problem
While it's easy
to see distant stars
because they radiate light,
other celestial bodies
are much harder to see
That's because light
has to travel
all the way from our Sun
to the object,
reflect off its surface,
and then make the long journey
back to Earth
By then, it's barely visible
David and Jane hoped that
advances in digital detectors,
now standard
in today's smartphones,
would help them see
a whole lot more
After searching for five years,
they finally found something
Here is the set
of discovery images
for the first object
So you can see this object
drifting from this picture
to this one to this one
It's drifting slowly to the left
When they found several more
of these slow-moving objects,
David and Jane could finally
declare Pluto is not alone
In fact, it's got
plenty of neighbors
They named this new region
of the solar system
the Kuiper Belt,
after Gerard Kuiper,
the astronomer who proposed
its existence back in the 1950s
The discovery of the Kuiper Belt
expanded our understanding
of the solar system
in a profound way,
but it also put Pluto's
planetary status in jeopardy
Is it a planet
or a Kuiper Belt object,
one of many?
My Dad knew there were rumblings
in the wind, and it upset him
It certainly was not easy
for my father
But the final blow
was yet to come
A few years later,
a young astronomer
decided to look for more objects
in the outer solar system
Mike Brown was determined
to do something really big:
find a Kuiper Belt object
larger than Pluto
We even thought
we might be finding things
the size of Mars,
the size of the Earth
We really had no idea
So when we started off
doing this back in 1997,
it was pretty exciting to think
what might be out there
At the Palomar Observatory
in California,
Mike had access to the largest
digital camera on earth
The images were uploaded
to his computer,
where he analyzed them
every morning
With technology on his side,
the discoveries
just kept on coming
We found Quaoar,
which is an object
out in the Kuiper Belt
that's about half the size
of Pluto
The next year,
we found something
about three-quarters
the size of Pluto,
and in the following year,
we found this thing,
and it was so bright
and also moving so slowly,
moving so slowly
because it was so far away
After all this time,
Mike couldn't believe
he might finally have found
what he had been looking for
I looked at it and I thought,
"This can't be right"
If it's that bright
and moving that slowly,
it's the furthest thing
we've ever found
and it's the biggest
thing we've ever found,
and it must be bigger than
Pluto, and that's crazy
It was the first object
to be discovered
that could have been larger
than Pluto
That caused a ruckus because,
well, if Pluto's a planet,
then this has got to be
a planet, right?
And so what are we going
to call these things?
Most people really
didn't care that much
about this thing that
we just discovered
They wanted to know, "Well,
what does it mean for Pluto?"
It's like, "Oh, yeah, you found
something bigger than Pluto
But what does it mean
for Pluto?"
For the past century, the IAU...
The International
Astronomical Union...
Has been in charge
of naming celestial objects,
but it couldn't give
Mike's discovery a name
without knowing if it was
a Kuiper Belt object
or the tenth planet
I think it started
an interesting conversation
because we didn't really have
a definition for planets, okay?
You know, it came
from the Greek "wandering star,"
and we did need a better way
of classifying things
as being planets or small bodies
in the solar system
At the IAU meeting in Prague,
a vote was taken
on a new definition
of the word "planet"
Pluto's fate came down to
the phrasing of just one line:
"a planet has cleared the
neighborhood around its orbit"
Pluto resides
in a crowded neighborhood
filled with thousands
of Kuiper Belt objects
Unlike larger planets,
tiny Pluto
doesn't have enough gravity
to clear them out of its way
It also has
an extreme elliptical orbit
not on the same plane
as the rest of the planets
Eight major things
which dominate the solar system
are planets
They're all big
They go in circular orbits
in one disk around the Sun
And everything else
is much smaller
Those are not planets
So according to the IAU,
Pluto is not a planet;
it's a "dwarf planet"
There has been
a consensus developed
that Pluto is a dwarf planet,
and you know,
I have no problem with that
The controversy comes in
when you try to say
a dwarf planet is not a planet
Well, it seems a little
ridiculous
to have "planet" in the word,
the designation for an object,
and say somehow
it's not a planet
In a sense, this question
of how do you label
certain objects
is less important
than understanding
that objects like Pluto,
the Earth, Jupiter, exoplanets
come in a remarkable variety
and in remarkably
different configurations
across the universe
While Pluto may no longer be
the solar system's ninth planet,
it turns out
it's got plenty of company
Planetary scientists continue
to discover more dwarf planets,
giving them temporary nicknames
like "Santa" and "Easterbunny"
We've discovered that
the outer solar system
is littered with small planets
These are typically rocky
and icy objects
Many have atmospheres
Many, possibly most, have moons
All the things we're used to
in the planets
we're familiar with,
but in miniature
I think a decent analogy is
when you see a Chihuahua,
it's still a dog
because it has
the characteristics
of the canine species,
just in miniature
Not everyone agrees with
Alan Stern's canine analogy,
and as more Kuiper Belt objects
are discovered,
the question arises:
how did our outer solar system
end up with these
pint-sized dwarfs?
To answer that,
we may need to look back
at the birth of the solar system
We think
that the solar system
began to form
about 4 5 to 4 6
billion years ago
when a cloud of nebula,
a cloud of gas and dust,
fell in on itself
because of its own gravity
As it fell together,
it began to turn
into a great disc
of orbiting, swirling material
It's that disc of gas and dust
that we think turns into planets
You make a planet
from material sticking together
and building
larger and larger pieces
Scientists theorize
that planets form
when this material starts
to stick together
Pebbles turn into boulders,
boulders into mountain-sized
comets
Comets turn into protoplanets
Protoplanets turn into planets
After objects reach a certain
threshold in their mass,
they can grow more rapidly
than they could before
because they have
substantial gravity
Gas giants like Jupiter
and Saturn
siphoned up massive amounts
of hydrogen and helium,
sweeping up everything in sight
It seems plausible that Pluto
originally formed
somewhat closer in to the Sun,
but then as those major planets
got larger and larger,
it got pushed
to a more distant orbit
We think that objects like Pluto
and the other Kuiper Belt bodies
are really the remains of that
process of planet formation
They are sometimes called
planetesimals,
celestial objects that somehow
stopped growing
Dwarf planets were arrested
in the mid-stage
of planetary growth
They are actually
planetary embryos
And to study those objects
rather than objects that grew
to much larger scales
will give us a great window
into the process
of planetary formation
Perhaps we can find clues
in the surface of Pluto
and its composition
that point towards
that deep history
and in turn tell us
about the architecture
of the solar system as it is now
Where did that come from?
How did that happen?
Pluto may even hold clues
to unravel another great mystery
As far as we know,
the requirements for life
are water, energy,
and organic matter
A large number of dwarf planets
may have all of these
ingredients
There are very reputable models
of Pluto
that suggest that there's
a vast interior ocean
and that these may be common
inside the dwarf planets
Wherever you have water,
then you have the potential...
And I want to stress that word,
"potential"... for biology
So it may be that
the dwarf planets
are not only
the most common kind of planet
in the solar system,
they may be
the most common abode for life
in the solar system
Clearly, organic chemistry,
carbon chemistry
can take place on the surface
of objects like comets
and probably
Kuiper Belt objects too
Whether or not that relates
to the existence
of life on Earth
I think is a totally open
question
But just understanding
the chemical richness
of our solar system
and the universe
is a big piece of the puzzle,
and it's a piece of the puzzle
that we need to solve
June 8, 2008
New Horizons has been
soaring through space
for more than two years
Today, it passes
the orbit of Saturn
In three more years,
it passes Uranus
It's spent half a decade
traveling through space,
and it's still running
like clockwork
But then the unexpected happens,
putting the entire mission
at risk
Images taken
by the Hubble Space Telescope
reveal Pluto has not one,
not two, not three, not four,
but five moons
All of these moons
probably all formed
in the same big
cosmic collision taking place
about 4 6 billion years ago,
where two Pluto-sized objects
rammed into each other,
and now we're seeing
the aftermath of that
In the end,
Pluto remained intact,
but the other object
broke into pieces,
forming the five moons
that we know of,
some very oddly shaped
All of these small moons
are debris generators,
creating the potential
of millimeter-sized dust
forming a ring around Pluto
The spacecraft is flying so fast
through the Pluto system,
roughly 30,000 miles per hour,
that if it hit even
a millimeter-sized particle,
it could blow a hole
in the spacecraft
and it could destroy the mission
Back in 1967,
this almost happened
to the Mars probe Mariner 4.
It ran into a cloud
of space dust
And over the course
of about 45 minutes,
they were seeing thousands
of impacts on the spacecraft,
completely unexpected
Clearly, there are particles
out there that we can't detect
that could potentially cause
a loss of mission
How much of a beating
can New Horizons take?
We're about to find out
at one of the most powerful
shooting galleries in the world
NASA's hypervelocity gun
can shoot the tiniest of pellets
up to 17,000 miles per hour
The dust particles
New Horizons might run into
range from the size
of the head of a pin
down to the size
of a grain of sand
These little objects
may not look very dangerous,
but imagine a sandstorm
with winds so strong
that just one grain of sand
could kill you
The gun is loaded
The room is cleared
This gun is so powerful,
metal is pulverized
from the impact
A pellet is propelled
down this 120-foot-long barrel
to a target
made of the materials
used in the construction
of the spacecraft
The first layer
is the gold thermal blanket
that covers New Horizons.
The second layer
is the spacecraft's wall
The third layer,
a thin metal plate,
represents the heart
of the spacecraft:
the electronics
and scientific instruments
Test after test is conducted,
tiny pellets slammed
into the target
at lightning speeds
The results are mixed
Most of the pellets penetrate
the gold thermal blanket
but are stopped by the wall
of the spacecraft
But not all
In fact, some, like this one,
punch a hole right through it
A few more holes like this
could put a quick
and violent end to the mission
The potential for a debris
impact that came out
through the detection
of the newer moons
does add another layer
of complexity to the flyby
The New Horizons team
had to come up
with alternate flight plans,
or trajectories,
for the spacecraft to travel
This is the ideal trajectory
they are hoping for
There are actually
four different trajectories
that we could potentially go on,
and we may not know
until a couple of weeks out
which one we're going to be on
The worst possible scenario is
it comes into the system,
it starts taking images,
it gets destroyed
by some impact,
and we'll never see the images,
which is pretty nerve-wracking
I want to see the results
I'm glad I'm not the person
waiting for that data to come
On the approach,
we have planned observations
to look for any other debris,
or we're calling them hazard
now... not moons, hazards
It's funny how things change
There'll always be
a little nagging question,
you know,
"Did we make it through?"
So that first beacon
that says we made it through,
everybody is just going to
They'll breathe a sigh of relief
and then they'll look
at each other and go,
"Oh, I knew it all along"
August 25, 2014
New Horizons reaches
Neptune's orbit
on the 25th anniversary
of Voyager 2's encounter
The original mission
was designed
to study only Jupiter,
Saturn, and their moons,
but Voyager 2 went on
to take stunning images
of Uranus, Neptune,
and its moon Triton
In the '60s and the '70s
and the '80s we were exploring
new planets all the time
First to Mars, first to Venus,
first to Mercury,
first to Jupiter,
first to Saturn
That came to an end in 1989
with Voyager.
It's been 25 years,
and now we're doing
the next first mission
That's epic
December 6, 2014
After years in hibernation,
the spacecraft is waking up
The final leg of its journey
is about to begin
Tonight, we're ending
hibernation
We have been hibernating
the spacecraft
for most of the
three-billion-mile journey
across the solar system
That's over now
It's really quite a historic day
Once the spacecraft has checked
that all systems are up
and running,
it will send a report
back to MOM
So when we receive
a signal from the spacecraft,
it's data that
the spacecraft sent
four-and-a-half hours earlier
And it requires a special
network of radio antennas
to receive it
Theses enormous antennas
are spaced across the globe
so as the Earth rotates,
the team can stay in touch
with the spacecraft 24/7
The spacecraft has
a ten-watt transmitter
That we can pick that signal up
on Earth is incredible
In comparison,
your average radio station
uses 50,000 watts
to transmit a signal
It is an amazing accomplishment,
and a lot of that's due
to the technology
that's at the stations,
at the Deep Space Network,
these amazing antennas
Getting ready for showtime here
A few members of the team
have gathered
in the room next door,
hoping to celebrate
But that moment will only arrive
when a very tense MOM
gets word from NASA's
Deep Space Network
that they are starting
to receive a signal
from New Horizons.
Data begins to show up
on her screen
Did we get it?
We got it
But before she can breathe easy,
all members
of the Mission Ops team
must verify that all systems
are in working order
RF, MOM on Pluto One
Status Check?
RF is green
Power status?
Power system is green
Propulsion status?
Propulsion is green
Oh, there we go!
We have a nominal wake-up
of the New Horizons spacecraft
on our way to Pluto
The team is ready
for the next leg of our journey
We've got an encounter coming
Yeah!
Yeah, how about that?
Some days,
it just goes like clockwork
Here we go, cheers
We're just gonna all take
a big breath now
To Pluto and beyond!
Hear, hear
To history
This has been a very long road
For the MOM!
Thank you
Well, it's just amazing
We are on the other side
of the solar system,
and where we were meant to be
When we talk
about the spacecraft,
we talk about it as if it's,
you know, our child, our baby
When it does something
that we don't expect,
we relate it perhaps
to "terrible twos"
or something like that,
so it really
it becomes part of us
Over the years,
hundreds of people
have dedicated themselves
to this historic mission
For many team members,
revealing Pluto's secrets
is the challenge of a lifetime
The New Horizons mission
has been a large part
of my life,
and it's been the majority
of my children's lives
I think they can't even imagine
what it'd be like
to have this data from Pluto,
because they've been
looking forward to it
for their whole life
As New Horizons gets closer
and closer to Pluto,
the team determines
there are no more moons
and little risk of the
spacecraft being destroyed
by debris
They looked and they
looked and they looked,
but they couldn't
find any new moons
I think they were kind
of disappointed
from a scientific standpoint,
but from a hazard standpoint
it was really good news
But the good news is short-lived
About 1:55 p m local, we've
lost signal with the spacecraft
You just feel that pit
in the bottom of your stomach
You're thinking, "Oh, my God,
I can't believe
this is happening"
Your pulse goes up a little bit
Could it be these millions of
miles away, we hit something?
Searching for a solution,
mission ops tries to connect
with New Horizon's
backup computer,
which transmits on
a different radio frequency
Right away, Deep Space Network
locked up onto that signal
and it was such a great feeling
because we found our spacecraft
Turned out that the main
processor had reset
and it had switched over
to the backup processor
That's sort of like
your worst nightmare
a week before an encounter
We knew that we could fix it
The question was:
were we going to be able to do
that in enough time?
Alice, I swear,
didn't get any sleep
But she said she slept
on the floor
for a few minutes one night
For a couple nights slept there
You know, just like a child
that's sick,
you want to be there to help it
recover along the way
The team fixes the problem
just seven days before
New Horizons is set
to fly by Pluto
We did it with four hours to
spare, or something like that
Yes, things are definitely
back onto track
And the pictures are flooding in
Every day, it's been getting
better and better
We've been getting beautiful
stuff for the last week
We are drooling
with anticipation
The next picture from LORRI
that we will see
is a full-frame image of Pluto
And it's the one that we think
is really going to tell us
what's happening
I almost can't wait for it
to come down
Taken almost half a million
miles away,
this is New Horizons last
portrait of Pluto
before its closest approach
Scientists speculate
the light areas are ice;
the dark could be a dusting
of organic molecules
that fall from the atmosphere
Wow
This is the heart, right?
This is the heart-shaped region,
being traced out here
Clearly there's a lot of craters
Boy!
It really is breathtaking
and awe-inspiring
I've never seen anything
like this before
But there's one more hurdle,
and it's a big one
The world watches
as the team tensely awaits
a signal from New Horizons
that it has made its closest
approach to Pluto
less than 8,000 miles
above the surface
and survived
with all systems intact
Stand by for telemetry
PI, MOM on Pluto 1
We have a healthy spacecraft
We've recorded data
of the Pluto system,
and we're outbound for Pluto
We did it
Very relieved and happy, yes
No, I mean, every polling
that was done,
every subsystem that reported in
was like music to my ears
It's never sounded that good
The next day,
the tiny spacecraft,
three billion miles from home,
starts beaming back
The first close-up pictures
of Pluto,
with icy mountains
11,000 feet high,
and Pluto's biggest moon,
Charon,
with hardly any impact craters
It will take about 16 months
for New Horizons to send back
all the photos and data
it has gathered
and years for scientists
to analyze it,
slowly revealing Pluto's secrets
as New Horizons itself
heads out through the icy
Kuiper belt and beyond
three billion miles from Earth
Our most powerful telescopes
see only a blur, until now
We have lift-off
A space probe called
New Horizons is on its way
This is an epic journey
To the far reaches
of our solar system
It's going farther
than any exploration
by human beings ever has
To capture images
of a mysterious world
that may hold the secret to the
origins of our solar system
Are there going to be surprises?
Absolutely
But not all the surprises
are good
About 1:55 p m local,
we've lost signal
with the spacecraft
Could it be we hit something?
But a last-minute rescue
saves the day
as Pluto comes into focus,
revealing a world stranger
than we ever imagined
Wow!
There's a heart on it!
"Chasing Pluto,"
right now on NOVA.
January 19, 2006
An Atlas 5 rocket,
a 212-foot powerhouse,
is prepped for launch
at Cape Canaveral
It was one of those days
where you say to yourself:
This is it
Project succeeds or fails today
Because when things go bad
on launch,
they usually go bad
in a spectacular way
T minus five, four,
three, two, one
We have ignition and liftoff
of NASA's New Horizons
spacecraft
on a voyage to visit
the planet Pluto and beyond
It's the fastest launch
ever recorded...
36,000 miles per hour
New Horizons needs
all the speed it can muster,
on a journey that will take it
clear across the solar system,
to attempt something unique
in the history of spaceflight:
get an up-close
and personal look at Pluto,
a mysterious, distant world
unlike anything
we've explored before
Back on Earth,
at the Johns Hopkins Applied
Physics Laboratory,
the mission operations team
for New Horizons
is not quite ready to celebrate
Once the rocket took off,
there was a great feeling of joy
and then you hold your breath
for a while
because you're not done
until you get the signal back
from the spacecraft
that everything's okay
We don't have a mission
until we know that spacecraft
is communicating with us
And so they wait
Everything is a concern
Things we've thought about
we know we've solved
To try and anticipate
so many eventualities,
it's the challenge
of spaceflight
Almost an hour passes
And then, Mission Ops receives
the first signal
from New Horizons.
Scientists turn
to each other and go,
"I love you, man!"
It was an astonishingly
happy time
And that's the greatest feeling,
because now we know we have
a mission to Pluto
This is just the first
of many challenges to come
on a journey that will take
almost a decade
Just nine hours
after leaving the launch pad,
it was already crossing
the orbit of the moon
A trip that took
Apollo astronauts three days
But even traveling tens
of thousands of miles an hour,
it will take over nine years
for New Horizons
to reach its destination,
to explore the far reaches
of our solar system, more than
three billion miles from Earth
Beyond the planets
we've come to know
Mars with its rocky red surface,
the gas giant Jupiter
with its raging storm,
and Saturn
with its stunning rings
Uranus, where turbulent winds
blow over 500 miles an hour,
and Neptune, a planet
so far from the Sun,
it takes 165 years
to complete just one orbit
Finally New Horizons
will arrive at Pluto,
a world we can only picture
with the help of artwork
like this, at least for now
Who can tell us more
about the planets?
Back in the 1950s,
every grade schooler
was taught there were
nine planets,
Pluto being the last
and loneliest
Everybody loved Pluto because
it was this funny oddball
sitting out there
at the very edge
You don't find that kind
of name recognition
and emotional connection
and interest level for Uranus,
or Mercury,
or going down the list,
but somehow Pluto just naturally
attracts people's attention
What makes Pluto so popular?
It may have something to do
with a playful bloodhound
named Pluto the pup
It turns out the Disney
character made its debut
around the same time the planet
was discovered
Over the years we've gotten
to know this beloved little pup
The same can't be said for this
mysterious little world
The truth is,
Pluto and its moons
have only been observed
from billions of miles away
Our best images,
nothing more than a blur
In fact, one of the biggest,
baddest space telescopes
in our arsenal, the Hubble,
which takes stunning images
of enormous distant galaxies,
can only capture these pixelated
images of Pluto,
because not only is it
far away, it's really small
But even at this resolution,
they suggest
something intriguing
Using these precious pixels,
a computer-generated image
reveals Pluto has
a surprisingly varied surface
The light areas
could be miles and miles of ice
The ices are the most
obvious signature that you see,
but you can discern that there's
other components there as well
We just don't know exactly
what they're made of
But here's what we do know:
one of the few planets
in the solar system
with such a varied surface
is planet Earth
We also know that Pluto has
a rather bizarre atmosphere
During its 248-year orbit,
as Pluto gets closer to the Sun,
its frozen surface starts
to thaw
and its atmosphere
slowly emerges
What we see in the atmosphere
is gases that are coming
off the surface,
creating a temporary
atmosphere, perhaps
Pluto has a unique type
of atmosphere
in this outer part
of the solar system
that we've never studied before
An area so distant and elusive
we knew almost nothing about it
until the 1990s,
when powerful new telescopes
discovered lonely little Pluto
wasn't so lonely after all
It's part of a region
in the outer solar system
beyond the orbit of Neptune
called the Kuiper Belt
And it is enormous
Billions of miles from the Sun,
the Kuiper Belt is filled
with hundreds of thousands
of icy objects
While they may look
like asteroids,
which are made of rock
and metal,
these objects, hidden in the
solar system's deep freeze,
are made of a mixture
of rock and ice
These are basically
frozen remnants
of the early part
of the solar system
that are still in the freezer
You can start to read
this fossil record
of how the solar system evolved
by looking at these objects
You can't say
for the New Horizons mission,
"Been there, done that,"
because it hasn't
We've already explored
the terrestrial planet region,
the giant planet region
Now we're exploring
a completely new portion
of the solar system
that's never been touched before
We don't know what we're going
to find, we really don't
And I think that that's what
really makes this so exciting
How do you design a spacecraft
that can survive
a three-billion-mile journey
to parts unknown?
Any time you explore
something new,
there's always a little risk
The New Horizons mission
faced a huge number
of challenges
We're going to the outskirts
of the solar system, you know,
30 times farther
from the Sun than the Earth
And so in order to get there
in a reasonable amount of time
we had to build the lightest
possible spacecraft
that we could,
put it on the largest rocket
we could
There was no opportunity
to fly big solar arrays
because the sunlight
is just too faint,
so we carry
a nuclear-powered source
We have a suite of instruments,
seven instruments
to do very different things
And they weigh less than about
70 pounds, all of them together
Seven scientific instruments
not much bigger
than a grand piano
with whimsical names
like Pepsi, Swap,
and an antenna named Rex
Two are named
after the lead characters
in the 1950s television show
The Honeymooners,
Ralph and Alice
All of these instruments
will analyze Pluto's surface
and geology, and reveal secrets
about its mysterious atmosphere
Back in the 1980s,
one of the best ways
to observe Pluto's atmosphere
was with this,
a C-141 cargo plane
with a makeshift observatory
on its side
The Kuiper Airborne Observatory
was not what you'd call
a first-class ride
The Kuiper Airborne Observatory
is not built for comfort
You're on headsets
the whole time
It's very loud, it's very cold
The telescope, it's
in the middle of an airplane
It bounces around
But by flying a telescope
above the weather,
they had a chance
to capture a rare event
called a stellar occultation
During this event,
an object, like Pluto,
passes in front of a bright star
blocking its light
If the object has an atmosphere,
the light gradually fades out,
then slowly fades back up again
But if it doesn't,
the light abruptly disappears,
and then quickly reappears
This is a recording
of what happened
onboard the Kuiper
Airborne Observatory
the night of June 9, 1988,
when a group of researchers
were determined to find out
if Pluto has an atmosphere
The light behind Pluto
slowly faded,
and the crew made history
I was fortunate enough
to be involved
I would call that the beginning
of my being an astronomer,
and it's a pretty good beginning
One of the instruments
onboard New Horizons
that's designed to study Pluto's
elusive atmosphere is Alice
This model is an actual size
model of Alice
Alice is an ultraviolet
spectrometer
It's a telescope that breaks up
light into a rainbow
Every chemical element
reflects and absorbs light
in a unique way,
creating a pattern
as distinct as a fingerprint
Hydrogen's fingerprint
looks like this,
while nitrogen's looks like this
Powerful Earth-based telescopes
have already detected molecules
of nitrogen, methane and carbon
monoxide on Pluto's surface
and in its atmosphere
We suspect it has
a number of others that we
simply can't detect
As the spacecraft flies
just a few thousand miles
above Pluto, Alice will search
for those fingerprints
Then, at the end of the flyby,
the spacecraft will turn around
to give Alice a one-of-a-kind
view of Pluto's atmosphere,
as seen through the light
of the Sun
We can use the Sun
as our light source
to probe the atmosphere
and look for those fingerprints
of certain types
of atoms and molecules
While Alice probes
Pluto's atmosphere,
her partner, Ralph,
an infrared spectrometer,
will be hard at work searching
for those chemical fingerprints
of molecules on Pluto's surface
We want to know what's causing
the very bright surfaces
on Pluto, which we think
is exotic snowflakes of
molecular nitrogen and methane
But there are other regions
that seem to be devoid
of those snowflakes
and are probably much redder,
darker hydrocarbon deposits
Ralph will finally reveal
what these strange,
dark regions are made of
But to get up-close
and personal images of Pluto
requires an instrument with
a one-of-a-kind telephoto lens
The largest imager on board
New Horizons, named LORRI,
will capture extraordinary
images of Pluto's surface
LORRI will take pictures
so detailed
that if it was flying
over New York City,
you could see the Hudson River,
the East River,
even Central Park
To put this in perspective,
this image of the Big Apple
was taken by a satellite
traveling about 400 miles
above Earth
LORRI is so powerful,
it could capture
the same amount of detail
from more than 7,000 miles
above Earth
But sending a telescope
with a lens like this
into the grueling subzero
temperatures of the Kuiper Belt
is risky business
When you have a telescope,
it's opened to space,
and so it's cooling
through that opening
The result is that you're
putting part of camera cold,
part of it warm,
and that changes
the shape of the telescope
and that tends to put it
out of focus
And you can end up with pictures
that look like this
To solve this problem
they turn to a material
found in bulletproof vests
What makes vests
like this so strong
is a compound
called silicon carbide
LORRI is made out of
a special version of it
which is able to tolerate
temperature gradients
without distorting its shape
But it's also very strong
and very light
There's a lot of things
that might go wrong,
and we've tried to anticipate
all those things
and work out contingency plans,
and contingency plans
for those contingency plans
We've been working for years
to get the spacecraft ready,
prepare for everything
you could think of
In the end, it just
You know, you just have
to sit there and wait,
and it just either works
or it doesn't
For the New Horizons team,
waiting to find out
if all their hard work
will pay off
just may be the toughest
challenge of all
During the Pluto encounter,
the spacecraft's
basically pre-programmed
to do everything on its own
If it gets into trouble,
we can't help
We can't give it a call and say,
"Whoops, you're looking
at the wrong thing
Adjust your sights
a little bit to the left"
That's because when
the spacecraft flies by Pluto,
it will take
four-and-a-half hours
for a radio signal
to reach Earth
and another
four-and-a-half hours
for instructions
to get back to the spacecraft
If something went wrong,
it would be more than nine hours
before we could tell it
to do something
The most important science
is happening really only
over about a 12-hour period
The timing has to be precise
because the onboard commands
all have a predetermined time
that this is supposed to happen
If that time changes too much,
we'll get a lot of pictures
of black space
and we'll miss the science
February 28, 2007
New Horizons has been en route
for a little over a year
Back at mission operations
at the Johns Hopkins
Applied Physics Laboratory,
the team prepares
for the spacecraft's
first real test since launch
As New Horizons nears Jupiter,
it must hit a mark
just 500 miles wide,
where it will get pulled
into the gas giant's gravity
and get flung out
At that point, it will be
traveling a lot faster
Think of it like a clever
maneuver used in roller derby
called "the whip"
One skater pulls another,
propelling her forward
with greater velocity
That's what Jupiter's gravity
will hopefully do
for New Horizons.
At mission operations,
the tension is palpable,
especially for the mission
operations manager,
Alice Bowman,
also known as "MOM"
Status check
She has spent years
preparing for this moment,
and she knows all too well
what it means
if this maneuver should fail
It would take years longer
to get to Pluto
if you did not have that flyby
If you think nine years
is a long time,
adding another couple years
onto that,
that would have been intolerable
The clock is ticking
MOM, along with
the Mission Ops team,
waits to receive telemetry
from the spacecraft
This data will reveal
whether New Horizons
successfully pulled off
the gravity assist or not
Red is bad, green is good,
gray means you don't have
any data
Finally, they hear
from the spacecraft
PI, this is MOM on Pluto One
Spacecraft telemetry
for all subsystems is nominal
Spacecraft is outward bound
from Jupiter
and we're on our way to Pluto
So far, so great
This is good
By stealing some momentum
from Jupiter
along the way to Pluto,
we can actually increase
the speed of the spacecraft
by about 20% and cut three years
off the travel time
And at the same time,
because in order to do
the Jupiter flyby
you end up coming
fairly close to it,
it gives you an opportunity
to do some great science
It was the only time we were
going to have large objects
for the cameras
to actually point to and say,
"Okay, are we doing this right?"
We used all the instruments
on New Horizons,
but LORRI was prominent
Okay, thar she blows
Oh, wow!
Look at that!
And we got both of them,
we got both of them
It's beautiful!
From more than
a million miles away,
LORRI captures a sequence
of images
of the eruption of a volcano
on Jupiter's moon Io
It was the first time
that a time-lapse
had ever been made
of any volcano anywhere
in the universe off the Earth
So it was really unique
It's another plume!
Perfect image
Yeah!
We were extremely lucky
we got these fantastic movies
It made all those sleepless
nights and all that hard work
very much worth it
After the gravity assist,
New Horizons
goes into hibernation
Only essential systems
are up and running
This limits the amount of wear
and tear on the equipment
For most of its nine-year
journey, it will be asleep,
but once a week, the spacecraft
phones home to MOM
This is MOM on Pluto One,
status check
And MOM lets the whole team know
if all systems
are in working order
As New Horizons makes its way
across the solar system
to the last and loneliest planet
to be explored,
back on Earth, a revolution
in astronomy is taking place
After 75 years as the solar
system's ninth planet,
Pluto is getting
its walking papers
Pluto was, since 1930, a planet
He had stature, he had friends
Could it be the final indignity
for the farthest and smallest
planet in our solar system?
♪ Rock on, Pluto, you'll always
be a planet to me ♪
Size doesn't matter!
The public takes to the streets
to fight for Pluto
Go, Pluto!
Pluto forever!
It's been America's
favorite planet
since it was discovered
back in the 1930s
by the unlikeliest
of planet hunters
Clyde Tombaugh was
a self-educated farm boy
who attended
a one-room schoolhouse
His first job in astronomy
included cleaning telescopes
and sweeping up
at the Lowell Observatory
He spent the rest of his time
searching for something
that could be causing
disturbances in Neptune's orbit:
the mysterious "Planet X"
Every few nights,
he placed a photosensitive
glass plate on the telescope,
securing it
so it would not shift
Then he exposed the plate
for one hour
to the universe
During that time, the motorized
telescope slowly moved
to compensate
for Earth's rotation
Several days later,
he'd retrace his steps,
taking pictures
of the same sections of the sky
he had photographed earlier
Then, using an ingenious device
called a blink comparator,
Clyde aligned the two images
to carefully examine
their differences
The blink comparator enabled him
to shift back and forth,
searching for the subtlest
of changes
Although the human eye is good
at spotting differences,
finding a dim celestial object
billions of miles away
was a daunting task
Month after month,
he forged ahead
through a harsh, cold winter
He almost froze to death
one night because his fingers
got so numb,
he couldn't get
the trap door open
to get out of the dome
They were having
a lot of problems
with the photographic plates
breaking in the cold weather,
and he invented
a new plate holder
that would keep the plates
from breaking,
and that's what led
to the discovery
After patiently searching
for almost a year,
a determined Clyde
finally found a tiny dot
slowly moving
across the night sky
Can you see it?
Here it is
Two months later,
the Lowell Observatory
proudly announced that
a young assistant
had discovered the ninth planet
in our solar system
Because of the discovery,
my dad got his college education
Otherwise, he probably
would not have been able
to afford to go to college
The discovery was, I would say,
the driver of our life
in many ways
After discovering Pluto,
Clyde taught astronomy,
and for decades to come,
he searched for another planet
in the far reaches
of the solar system
But as hard as he
and other astronomers looked...
And they looked hard...
Nobody found anything
Until astronomers David Jewitt
and Jane Luu
took on the challenge
They started a search
that would take a lot longer
than they could ever imagine
Why did it take so long?
It was a matter of technology
catching up with the problem
While it's easy
to see distant stars
because they radiate light,
other celestial bodies
are much harder to see
That's because light
has to travel
all the way from our Sun
to the object,
reflect off its surface,
and then make the long journey
back to Earth
By then, it's barely visible
David and Jane hoped that
advances in digital detectors,
now standard
in today's smartphones,
would help them see
a whole lot more
After searching for five years,
they finally found something
Here is the set
of discovery images
for the first object
So you can see this object
drifting from this picture
to this one to this one
It's drifting slowly to the left
When they found several more
of these slow-moving objects,
David and Jane could finally
declare Pluto is not alone
In fact, it's got
plenty of neighbors
They named this new region
of the solar system
the Kuiper Belt,
after Gerard Kuiper,
the astronomer who proposed
its existence back in the 1950s
The discovery of the Kuiper Belt
expanded our understanding
of the solar system
in a profound way,
but it also put Pluto's
planetary status in jeopardy
Is it a planet
or a Kuiper Belt object,
one of many?
My Dad knew there were rumblings
in the wind, and it upset him
It certainly was not easy
for my father
But the final blow
was yet to come
A few years later,
a young astronomer
decided to look for more objects
in the outer solar system
Mike Brown was determined
to do something really big:
find a Kuiper Belt object
larger than Pluto
We even thought
we might be finding things
the size of Mars,
the size of the Earth
We really had no idea
So when we started off
doing this back in 1997,
it was pretty exciting to think
what might be out there
At the Palomar Observatory
in California,
Mike had access to the largest
digital camera on earth
The images were uploaded
to his computer,
where he analyzed them
every morning
With technology on his side,
the discoveries
just kept on coming
We found Quaoar,
which is an object
out in the Kuiper Belt
that's about half the size
of Pluto
The next year,
we found something
about three-quarters
the size of Pluto,
and in the following year,
we found this thing,
and it was so bright
and also moving so slowly,
moving so slowly
because it was so far away
After all this time,
Mike couldn't believe
he might finally have found
what he had been looking for
I looked at it and I thought,
"This can't be right"
If it's that bright
and moving that slowly,
it's the furthest thing
we've ever found
and it's the biggest
thing we've ever found,
and it must be bigger than
Pluto, and that's crazy
It was the first object
to be discovered
that could have been larger
than Pluto
That caused a ruckus because,
well, if Pluto's a planet,
then this has got to be
a planet, right?
And so what are we going
to call these things?
Most people really
didn't care that much
about this thing that
we just discovered
They wanted to know, "Well,
what does it mean for Pluto?"
It's like, "Oh, yeah, you found
something bigger than Pluto
But what does it mean
for Pluto?"
For the past century, the IAU...
The International
Astronomical Union...
Has been in charge
of naming celestial objects,
but it couldn't give
Mike's discovery a name
without knowing if it was
a Kuiper Belt object
or the tenth planet
I think it started
an interesting conversation
because we didn't really have
a definition for planets, okay?
You know, it came
from the Greek "wandering star,"
and we did need a better way
of classifying things
as being planets or small bodies
in the solar system
At the IAU meeting in Prague,
a vote was taken
on a new definition
of the word "planet"
Pluto's fate came down to
the phrasing of just one line:
"a planet has cleared the
neighborhood around its orbit"
Pluto resides
in a crowded neighborhood
filled with thousands
of Kuiper Belt objects
Unlike larger planets,
tiny Pluto
doesn't have enough gravity
to clear them out of its way
It also has
an extreme elliptical orbit
not on the same plane
as the rest of the planets
Eight major things
which dominate the solar system
are planets
They're all big
They go in circular orbits
in one disk around the Sun
And everything else
is much smaller
Those are not planets
So according to the IAU,
Pluto is not a planet;
it's a "dwarf planet"
There has been
a consensus developed
that Pluto is a dwarf planet,
and you know,
I have no problem with that
The controversy comes in
when you try to say
a dwarf planet is not a planet
Well, it seems a little
ridiculous
to have "planet" in the word,
the designation for an object,
and say somehow
it's not a planet
In a sense, this question
of how do you label
certain objects
is less important
than understanding
that objects like Pluto,
the Earth, Jupiter, exoplanets
come in a remarkable variety
and in remarkably
different configurations
across the universe
While Pluto may no longer be
the solar system's ninth planet,
it turns out
it's got plenty of company
Planetary scientists continue
to discover more dwarf planets,
giving them temporary nicknames
like "Santa" and "Easterbunny"
We've discovered that
the outer solar system
is littered with small planets
These are typically rocky
and icy objects
Many have atmospheres
Many, possibly most, have moons
All the things we're used to
in the planets
we're familiar with,
but in miniature
I think a decent analogy is
when you see a Chihuahua,
it's still a dog
because it has
the characteristics
of the canine species,
just in miniature
Not everyone agrees with
Alan Stern's canine analogy,
and as more Kuiper Belt objects
are discovered,
the question arises:
how did our outer solar system
end up with these
pint-sized dwarfs?
To answer that,
we may need to look back
at the birth of the solar system
We think
that the solar system
began to form
about 4 5 to 4 6
billion years ago
when a cloud of nebula,
a cloud of gas and dust,
fell in on itself
because of its own gravity
As it fell together,
it began to turn
into a great disc
of orbiting, swirling material
It's that disc of gas and dust
that we think turns into planets
You make a planet
from material sticking together
and building
larger and larger pieces
Scientists theorize
that planets form
when this material starts
to stick together
Pebbles turn into boulders,
boulders into mountain-sized
comets
Comets turn into protoplanets
Protoplanets turn into planets
After objects reach a certain
threshold in their mass,
they can grow more rapidly
than they could before
because they have
substantial gravity
Gas giants like Jupiter
and Saturn
siphoned up massive amounts
of hydrogen and helium,
sweeping up everything in sight
It seems plausible that Pluto
originally formed
somewhat closer in to the Sun,
but then as those major planets
got larger and larger,
it got pushed
to a more distant orbit
We think that objects like Pluto
and the other Kuiper Belt bodies
are really the remains of that
process of planet formation
They are sometimes called
planetesimals,
celestial objects that somehow
stopped growing
Dwarf planets were arrested
in the mid-stage
of planetary growth
They are actually
planetary embryos
And to study those objects
rather than objects that grew
to much larger scales
will give us a great window
into the process
of planetary formation
Perhaps we can find clues
in the surface of Pluto
and its composition
that point towards
that deep history
and in turn tell us
about the architecture
of the solar system as it is now
Where did that come from?
How did that happen?
Pluto may even hold clues
to unravel another great mystery
As far as we know,
the requirements for life
are water, energy,
and organic matter
A large number of dwarf planets
may have all of these
ingredients
There are very reputable models
of Pluto
that suggest that there's
a vast interior ocean
and that these may be common
inside the dwarf planets
Wherever you have water,
then you have the potential...
And I want to stress that word,
"potential"... for biology
So it may be that
the dwarf planets
are not only
the most common kind of planet
in the solar system,
they may be
the most common abode for life
in the solar system
Clearly, organic chemistry,
carbon chemistry
can take place on the surface
of objects like comets
and probably
Kuiper Belt objects too
Whether or not that relates
to the existence
of life on Earth
I think is a totally open
question
But just understanding
the chemical richness
of our solar system
and the universe
is a big piece of the puzzle,
and it's a piece of the puzzle
that we need to solve
June 8, 2008
New Horizons has been
soaring through space
for more than two years
Today, it passes
the orbit of Saturn
In three more years,
it passes Uranus
It's spent half a decade
traveling through space,
and it's still running
like clockwork
But then the unexpected happens,
putting the entire mission
at risk
Images taken
by the Hubble Space Telescope
reveal Pluto has not one,
not two, not three, not four,
but five moons
All of these moons
probably all formed
in the same big
cosmic collision taking place
about 4 6 billion years ago,
where two Pluto-sized objects
rammed into each other,
and now we're seeing
the aftermath of that
In the end,
Pluto remained intact,
but the other object
broke into pieces,
forming the five moons
that we know of,
some very oddly shaped
All of these small moons
are debris generators,
creating the potential
of millimeter-sized dust
forming a ring around Pluto
The spacecraft is flying so fast
through the Pluto system,
roughly 30,000 miles per hour,
that if it hit even
a millimeter-sized particle,
it could blow a hole
in the spacecraft
and it could destroy the mission
Back in 1967,
this almost happened
to the Mars probe Mariner 4.
It ran into a cloud
of space dust
And over the course
of about 45 minutes,
they were seeing thousands
of impacts on the spacecraft,
completely unexpected
Clearly, there are particles
out there that we can't detect
that could potentially cause
a loss of mission
How much of a beating
can New Horizons take?
We're about to find out
at one of the most powerful
shooting galleries in the world
NASA's hypervelocity gun
can shoot the tiniest of pellets
up to 17,000 miles per hour
The dust particles
New Horizons might run into
range from the size
of the head of a pin
down to the size
of a grain of sand
These little objects
may not look very dangerous,
but imagine a sandstorm
with winds so strong
that just one grain of sand
could kill you
The gun is loaded
The room is cleared
This gun is so powerful,
metal is pulverized
from the impact
A pellet is propelled
down this 120-foot-long barrel
to a target
made of the materials
used in the construction
of the spacecraft
The first layer
is the gold thermal blanket
that covers New Horizons.
The second layer
is the spacecraft's wall
The third layer,
a thin metal plate,
represents the heart
of the spacecraft:
the electronics
and scientific instruments
Test after test is conducted,
tiny pellets slammed
into the target
at lightning speeds
The results are mixed
Most of the pellets penetrate
the gold thermal blanket
but are stopped by the wall
of the spacecraft
But not all
In fact, some, like this one,
punch a hole right through it
A few more holes like this
could put a quick
and violent end to the mission
The potential for a debris
impact that came out
through the detection
of the newer moons
does add another layer
of complexity to the flyby
The New Horizons team
had to come up
with alternate flight plans,
or trajectories,
for the spacecraft to travel
This is the ideal trajectory
they are hoping for
There are actually
four different trajectories
that we could potentially go on,
and we may not know
until a couple of weeks out
which one we're going to be on
The worst possible scenario is
it comes into the system,
it starts taking images,
it gets destroyed
by some impact,
and we'll never see the images,
which is pretty nerve-wracking
I want to see the results
I'm glad I'm not the person
waiting for that data to come
On the approach,
we have planned observations
to look for any other debris,
or we're calling them hazard
now... not moons, hazards
It's funny how things change
There'll always be
a little nagging question,
you know,
"Did we make it through?"
So that first beacon
that says we made it through,
everybody is just going to
They'll breathe a sigh of relief
and then they'll look
at each other and go,
"Oh, I knew it all along"
August 25, 2014
New Horizons reaches
Neptune's orbit
on the 25th anniversary
of Voyager 2's encounter
The original mission
was designed
to study only Jupiter,
Saturn, and their moons,
but Voyager 2 went on
to take stunning images
of Uranus, Neptune,
and its moon Triton
In the '60s and the '70s
and the '80s we were exploring
new planets all the time
First to Mars, first to Venus,
first to Mercury,
first to Jupiter,
first to Saturn
That came to an end in 1989
with Voyager.
It's been 25 years,
and now we're doing
the next first mission
That's epic
December 6, 2014
After years in hibernation,
the spacecraft is waking up
The final leg of its journey
is about to begin
Tonight, we're ending
hibernation
We have been hibernating
the spacecraft
for most of the
three-billion-mile journey
across the solar system
That's over now
It's really quite a historic day
Once the spacecraft has checked
that all systems are up
and running,
it will send a report
back to MOM
So when we receive
a signal from the spacecraft,
it's data that
the spacecraft sent
four-and-a-half hours earlier
And it requires a special
network of radio antennas
to receive it
Theses enormous antennas
are spaced across the globe
so as the Earth rotates,
the team can stay in touch
with the spacecraft 24/7
The spacecraft has
a ten-watt transmitter
That we can pick that signal up
on Earth is incredible
In comparison,
your average radio station
uses 50,000 watts
to transmit a signal
It is an amazing accomplishment,
and a lot of that's due
to the technology
that's at the stations,
at the Deep Space Network,
these amazing antennas
Getting ready for showtime here
A few members of the team
have gathered
in the room next door,
hoping to celebrate
But that moment will only arrive
when a very tense MOM
gets word from NASA's
Deep Space Network
that they are starting
to receive a signal
from New Horizons.
Data begins to show up
on her screen
Did we get it?
We got it
But before she can breathe easy,
all members
of the Mission Ops team
must verify that all systems
are in working order
RF, MOM on Pluto One
Status Check?
RF is green
Power status?
Power system is green
Propulsion status?
Propulsion is green
Oh, there we go!
We have a nominal wake-up
of the New Horizons spacecraft
on our way to Pluto
The team is ready
for the next leg of our journey
We've got an encounter coming
Yeah!
Yeah, how about that?
Some days,
it just goes like clockwork
Here we go, cheers
We're just gonna all take
a big breath now
To Pluto and beyond!
Hear, hear
To history
This has been a very long road
For the MOM!
Thank you
Well, it's just amazing
We are on the other side
of the solar system,
and where we were meant to be
When we talk
about the spacecraft,
we talk about it as if it's,
you know, our child, our baby
When it does something
that we don't expect,
we relate it perhaps
to "terrible twos"
or something like that,
so it really
it becomes part of us
Over the years,
hundreds of people
have dedicated themselves
to this historic mission
For many team members,
revealing Pluto's secrets
is the challenge of a lifetime
The New Horizons mission
has been a large part
of my life,
and it's been the majority
of my children's lives
I think they can't even imagine
what it'd be like
to have this data from Pluto,
because they've been
looking forward to it
for their whole life
As New Horizons gets closer
and closer to Pluto,
the team determines
there are no more moons
and little risk of the
spacecraft being destroyed
by debris
They looked and they
looked and they looked,
but they couldn't
find any new moons
I think they were kind
of disappointed
from a scientific standpoint,
but from a hazard standpoint
it was really good news
But the good news is short-lived
About 1:55 p m local, we've
lost signal with the spacecraft
You just feel that pit
in the bottom of your stomach
You're thinking, "Oh, my God,
I can't believe
this is happening"
Your pulse goes up a little bit
Could it be these millions of
miles away, we hit something?
Searching for a solution,
mission ops tries to connect
with New Horizon's
backup computer,
which transmits on
a different radio frequency
Right away, Deep Space Network
locked up onto that signal
and it was such a great feeling
because we found our spacecraft
Turned out that the main
processor had reset
and it had switched over
to the backup processor
That's sort of like
your worst nightmare
a week before an encounter
We knew that we could fix it
The question was:
were we going to be able to do
that in enough time?
Alice, I swear,
didn't get any sleep
But she said she slept
on the floor
for a few minutes one night
For a couple nights slept there
You know, just like a child
that's sick,
you want to be there to help it
recover along the way
The team fixes the problem
just seven days before
New Horizons is set
to fly by Pluto
We did it with four hours to
spare, or something like that
Yes, things are definitely
back onto track
And the pictures are flooding in
Every day, it's been getting
better and better
We've been getting beautiful
stuff for the last week
We are drooling
with anticipation
The next picture from LORRI
that we will see
is a full-frame image of Pluto
And it's the one that we think
is really going to tell us
what's happening
I almost can't wait for it
to come down
Taken almost half a million
miles away,
this is New Horizons last
portrait of Pluto
before its closest approach
Scientists speculate
the light areas are ice;
the dark could be a dusting
of organic molecules
that fall from the atmosphere
Wow
This is the heart, right?
This is the heart-shaped region,
being traced out here
Clearly there's a lot of craters
Boy!
It really is breathtaking
and awe-inspiring
I've never seen anything
like this before
But there's one more hurdle,
and it's a big one
The world watches
as the team tensely awaits
a signal from New Horizons
that it has made its closest
approach to Pluto
less than 8,000 miles
above the surface
and survived
with all systems intact
Stand by for telemetry
PI, MOM on Pluto 1
We have a healthy spacecraft
We've recorded data
of the Pluto system,
and we're outbound for Pluto
We did it
Very relieved and happy, yes
No, I mean, every polling
that was done,
every subsystem that reported in
was like music to my ears
It's never sounded that good
The next day,
the tiny spacecraft,
three billion miles from home,
starts beaming back
The first close-up pictures
of Pluto,
with icy mountains
11,000 feet high,
and Pluto's biggest moon,
Charon,
with hardly any impact craters
It will take about 16 months
for New Horizons to send back
all the photos and data
it has gathered
and years for scientists
to analyze it,
slowly revealing Pluto's secrets
as New Horizons itself
heads out through the icy
Kuiper belt and beyond