WEBVTT FILE

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[music playing]

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- Some planets have many moons,
and others have none.

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But Earth has one,
and it's amazing.

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[music playing]

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kids: "Our World."
[laughter]

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- The Moon is the brightest
object in the sky

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after the Sun,
and it plays a big role

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in patterns
we see here on Earth.

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Did you know that our Moon
is the reason for tides?

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- That's right,
a tide is another word for

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"gravitational pull."

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The Moon pulls on the Earth,

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but the Earth also
pulls tides on the Moon.

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When the water is in motion,

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it moves towards the Moon,
and that gives us a tide.

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The tide also
is important for the Earth

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because it moves water around.

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When water moves around
nutrients move around,

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and a lot of animals
and even humans

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depend on having tides.

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A lot of us also
depend on moonlight

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for navigating at night.

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It provides light
in our night sky.

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So there's a lot of reasons

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that we like to have
the Moon around.

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- Cool.

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The Moon really does
have a big effect on Earth.

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But how do we know
so much about our moon?

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- Well, people have always
looked at the Moon

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in wonder in our night sky.

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It's so bright
and it's so close,

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and we'd like to know
more about

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what it's made out of
and how it got to be there.

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So NASA develops missions
to the Moon

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and to other planets
to understand

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how we all work together
as a solar system.

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NASA has been sending
missions to the Moon

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since the 1960s,

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starting with robotic missions

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and building
to human missions.

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We sent humans to the Moon
with the Apollo missions

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to pick up rocks
to bring back to the Earth

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and to learn about
the Moon's environment.

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Since then, we've been
sending robotic missions

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like LRO and
LCROSS and LADEE

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that have helped us
map the surface of the Moon.

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We have maps that show us
the surface features,

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the craters
and the lava flows.

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We have maps of temperature.

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We have maps of
the gravity of the Moon.

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And all of those things
help us understand

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what the Moon is made out of.

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It turns out
the Moon is not dry.

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It has water on it,
actually,

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but the water is frozen.

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The water is frozen
at the north and south pole

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in deep craters
that are permanently shadowed.

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They never
receive any sunlight,

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so they don't ever heat up.

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And that water
can stay frozen

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for billions of years.

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We hope someday to be able
to go to that water

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and extract it and
use it to live on the Moon.

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Even though we know
a lot about the Moon,

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there's still so much more
we want to learn.

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We'd like to be able
to send landers there

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and rovers, just like
we do for Mars.

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- So as long as we have
questions about the Moon,

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NASA will keep
planning missions

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to answer those questions,

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because the Moon is
pretty important to our world.

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I'm Mishay.
I'll see you next time.

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[music playing]

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kids: "Our World."
[laughter]