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{\an8}The alien expert is in.
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Time to get to work.
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As Carl Sagan once said,
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"Extraordinary claims
require extraordinary evidence."
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Sorry you didn't get sent into space,
RoboSimian.
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But you can still have
plenty of fun here with us.
But you can still have
plenty of fun here with us.
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They're not programmed for fun, sir.
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[scoffs] We'll see about that.
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Please stop dribbling Jupiter.
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Hello, honorary NASA scientists.
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I'm glad to see you
all making yourselves at home.
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[music plays]
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[clears throat]
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Maybe a little too at home.
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[Charlie Brown] Excuse me, CARA.
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I know we're looking for life, but what
kind of life are we looking for exactly?
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Well, the life we're looking for
could be incredibly simple.
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Perhaps even made up of only one cell.
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Very different from the human body,
which is made up of trillions of cells.
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But the kind of life we're looking for
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could also be all weird
and green and blobby, right?
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Well, technically, I suppose anything
is possible. But most likely not.
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How will we know when we find it?
How will we know when we find it?
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[CARA] So glad you asked.
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All life forms, even the simplest,
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need a few basic things,
beginning with water.
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Scientists have looked all over Earth
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and discovered wherever
there's liquid water, there's life.
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Even in the most unlikely places
or extreme conditions.
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We think that's probably true
for life beyond Earth too.
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Life also needs organics, which are
molecules that contain the element carbon.
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On Earth, every living thing
contains carbon,
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from a flea to a tree.
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Next, life needs energy to support it.
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And time to evolve.
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So, if NASA can find all these things
somewhere outside Earth--
So, if NASA can find all these things
somewhere outside Earth--
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We might find life!
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[all] Ohhh.
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Well, what are we waiting for?
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Everyone knows Saturn is the best planet.
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It has its own jewelry.
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All the best alien movies
are about Martians.
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How about we start with Mars?
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[CARA] That's an excellent idea.
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Mars has been at the center
of a lot of NASA's search for life.
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In fact, NASA has rovers
collecting data there right now.
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[imitates racing noises]
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[clears throat]
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Sorry, ma'am.
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Wow. Mars, the famous Red Planet.
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Fourth farthest from the sun.
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Home to two moons and the largest
dust storms in the solar system.
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Can you imagine how amazing
it would be to actually go there
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and search for clues
to the existence of life?
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[Lucy] But the kind of life
we're looking for
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could also be all weird
and green and blobby, right?
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[gasps] Wait. Go back.
I think I found something.
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Is that ice?
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[gasps] Ice is frozen water!
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That's a huge clue
that there could be life.
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[all] Wow.
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Great first discovery, scientists.
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The water on Mars
appears to be mostly in the form of ice.
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But based on the pictures
from our telescopes and rovers,
But based on the pictures
from our telescopes and rovers,
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we believe that liquid water might
have existed on the surface of Mars
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a long time ago.
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Mars is extremely promising
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as a place where we might soon
find evidence of past life.
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In the meantime,
there is lots of space to keep exploring.
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Hmm.
Snoopy illustrates an important point.
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Good job, Snoopy.
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If we wanna keep finding more places
where there could be potential for life,
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we need to follow the water.
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Bleah. I'd rather not.
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[Lucy screams] I've been licked by a dog!
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[groaning]