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(♪)

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For centuries, humans
 have found their way on the

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trackless oceans using
 patterns of stars in the sky.

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Well, how will Juno find
its way to Jupiter

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in the trackless space of space?

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(♪)

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In order to get the
Juno spacecraft

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in orbit around Jupiter

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we have to navigate it
precisely in deep space.

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So let's say this
little model represents

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the Juno spacecraft, and this
 laser pointer and these two

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straws represent Juno's star
 tracker navigation system.

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Cameras onboard Juno look for
 a pattern of holiday lights

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in a black card.

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(record screeching sound)

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I mean, a pattern of
 stars in deep space.

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And when it recognizes the
 pattern that's been programmed

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into it by navigators here
 on Earth, it causes the tiny

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rocket motors to steer
  Juno precisely on course.

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Now, Juno doesn't wanna aim
 right for Jupiter itself.

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You wanna get in
 orbit around Jupiter.

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Now notice, even the slightest
 disturbance in deep space

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(tap)

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will cause Juno to miss.

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It will miss Jupiter,
it will miss its orbit,

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and it will miss
it by that much.

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Now that much doesn't
 seem like much here,

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but in deep space, that
much becomes hundreds of

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thousands of kilometers or
 miles, or millions of leagues.