How can we witness a galaxy’s death as it’s happening when the galaxy is 9 billion light years away?
In: Physics
We can’t. But if we get really lucky and are looking in the right direction at the right moment we can see something amazing. 9 billion years ago some event happened. The light from that event traveled at light speed for the entire 9 billion years until it was 9 billion light years away from it’s starting point. That is how far away we are from it. So that is when we finally get to see it happen.
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