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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Well, no. Andromeda has not collided with the Milky Way. When we look at Andromeda we are seeing the past though. For example, if the sun were to explode right now we would not know for 8 minutes because that is how long it takes for light to travel to earth from the sun.
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