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