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Vesto Sliphler was the first to notice that a lot of the nebulas were moving away from us and earth.
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Alexander Friedman was the first to predict the expansion of the universe
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Georges Lemaitre was a mathematician who developed the theory of the big bang.
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Edwin Hubble came up with the idea of red shifts
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Arno Penzias and Robert Wilson discovered Cosmic Microwave Background radiation
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The hubble telescope allowed us to look deeper and farther into space helping astronomers see that the universe is expanding.
