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- A light year is equal to 5,878,630,000,000 miles.
- Light travels 299,792,458 miles per second.
- Earth is 500 light seconds away from the sun. It takes 8 minutes and 20 seconds for light to reach the earth from the sun.
- Earth is about 4.5 billion years old.
- Proxima Centauri is the closest star to the earth besides the sun. It is 4.2 light years away.
jan 10 2012 ∞
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