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Today, 07:29

What does the doppler effect tell astronomers about the universe

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  1. Today, 09:21
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    The doppler effect has red and blue shifts. A red shift means something is moving farther away, and a blue shift means it is moving closer. The universe has a red shift, and since a red shift means that it is moving farther away, this tells astronomers that the universe is still expanding.
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