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21 May, 17:18

If a galaxy is located 200 million light years from Earth, what can you conclude about the light from that galaxy?

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  1. 21 May, 17:26
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    You can conclude that it takes light from that galaxy 200 million years to be seen on Earth. If that galaxy explodes tomorrow, we wouldn't know it for 200 million years. Maybe it already did. We don't know. We're seeing the galaxy as it appeared 200 million years ago.
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