Discovery Channel 100 Greatest Discoveries 1/9 Astronomy

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Copernicus first theorized that the Sun was the center of our solar system, but it took the work of Johannes Kepler to prove it. Learn why the universe is expanding and meet modern astronomers.

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Gregor Mendel's work with pea plants pioneered the study of genetics, but it wasn't until the creation of the double helix DNA model that the field really began to take off.
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