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♪
Narrator: Near light speed 101:
Near-light-speed travel times.

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While you will be traveling very fast, the universe is also
a very big place, so you might be in for some surprises.

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For example, even though you’re traveling at almost the speed of light—

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and time and space weirdness will make
the distance seem shorter to you—

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your rocket’s clock will still say it takes a bit more than nine months
just to get from the Earth to the edge of the solar system. 

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According to a clock on Earth, it’s even longer—
over a year and a half.

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That's not too bad, but to get to the next star system,
your clock would say it took you just over 2 years. 

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If you want to get to farther-out vacation spots, however,
you’ll probably need more than a few extra snacks. 

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A trip to the Andromeda galaxy, our nearest large neighbor galaxy,
could take over a million years,

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and a trip to the farthest known galaxy where it currently is
might take over 15 billion years,

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which…is more vacation time than I think I’ll ever have.

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Thanks for watching, and please...
be careful out there.

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ON-SCREEN: EXPLORE SOLAR SYSTEM & BEYOND

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ON-SCREEN: NASA logo

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(silence)