Shine

It's taken the light from other stars at least 4.2 years to reach us; 4.2 light-years is the distance to our closest neighboring star, Proxima Centauri. On average though, the light from other worlds is much, much older. Some of it has been traveling since before the Earth formed. Think about that the next time you look up at the night sky; the photons hitting your retina are ancient, and they've seen far more than you will in your brief instant here.

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