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Because we are observing the stars as they *where* not as they are now.
If we look in the night sky, we see stars, some are close, some are further away.
If we view, say Betelgeuse, we are seeing it as it was 640 years ago, because that is how far away from us it is in light years. For all we know it may have exploded as a supernova 639 years ago, but we won't know for another year.
So the stars you are viewing in the night sky, is what a star looked like, depending on the distance from us.
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∙ 14y ago
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