Example is andromeda is about to collied with us in 4 billion years but that light needs to travel then has it already happened but we wouldn’t see it since light needs to travel.
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You are exactly right that we see things as they used to be. Light is no different to, say, taking a photo and posting a photo to someone – it still takes time to arrive.
This can actually be useful for astrophysicists. Looking at distant stars and galaxies is literally looking back in time, and can tell us things about the history of the universe.
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