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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Andromeda is ~2.5million years away from us. This means we are seeing what andromeda looks like 2.5million years ago.
And in the span of 2.5million years, Andromeda has traveled 0.06% of the distance needed to collide with the milky way. if you looked 2.5million years ago andromeda and compare it to now. it looks like it didn’t move.
This is why we say the difference between a million and a billion is a billion.
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