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If we know the past as we can see what’s happened how do we not know what other civilizations see?

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If they’re far enough away, they’ll see earth as it was before humans were here. Homo sapiens only around for perhaps 200,000 yrs, language perhaps 50,000yrs. Milky Way galaxy 150,000 light yrs across, Andromeda galaxy 2.5 mill let yrs away. Space is VAST. Light takes long time to reach someone’s telescope, light or radio waves.

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