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comment Why is it concluded that the cosmos is expanding when in fact the observations are for events further back in time?
@DDD: We don't have an instant snapshot of the universe. The further we look, the longer the light took to reach us and the older the image we see. The farthest galaxies we see have ceased to exist long ago. We see them as they were billions of years ago. In the context of the universe, you can therefore replace "old" by "far away".