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How big is the universe? In the early twentieth century, scientists took sides. One held that the entire universe was contained in the Milky Way galaxy; their champion was the strong-willed astronomer Harlow Shapley. Another camp believed that the universe was so vast that the Milky Way was just one galaxy among billions--the view that would prevail, proven by the equally headstrong Edwin Hubble. Almost forgotten is the Harvard Observatory Computer--a...
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