AlunWH t1_j7vbz9e wrote
The closest planet outside our solar system is Proxima Centauri B.
Proxima Centauri B is 4.2 light years away. That may not sound that much, but it’s actually about 25 trillion miles. That’s 25,000,000,000,000.
The space shuttle Discovery could travel five miles a second. At 5 miles a second it would take 37,200 years to travel just one light year. One. So Proxima Centauri B is more than a hundred thousand years away for us.
A light year may not sound much, but it’s massive.
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