WEBVTT

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The interior of Jupiter is a tough problem for us.

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To get deep inside, we have to use
indirect methods. We can't go there.

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We think that Jupiter has a core but we don't know for sure.

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It is nonetheless likely to be perhaps ten times the mass of the earth.

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It may not be solid, it's very hot.

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The pressure is too great, the temperature is too high,
it's just too far in. We can't get there.

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So what we have to do is to use radiation that's coming to us
from those lower depths to tell us what's going on down there.

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And this is where Juno comes in.

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Juno is exciting because we will learn such a wide range of things.

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For indeed Jupiter is the most massive planet in the solar system.

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It is the body you want to understand in order to understand
the architecture of everything else, including Earth.

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What is the proportion of water on Jupiter compared to the amount of hydrogen on Jupiter?

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And how does that compare with the proportion of hydrogen
to water in interstellar space and in the sun?

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That's a very important question
and that's one of the things that Juno is going to address directly.

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I would expect Juno to tell us more about how planets work.

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Meaning how the heat gets out,
what kinds of flows exist inside the body, 

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how magnetic fields get generated.

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Learning what Jupiter is made of and learning about how it works

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Those to me are what make the Juno mission exciting.