Harlow Shapley (November 2, 1885 – October 20, 1972) was an American astronomer.
He is notable for his groundbreaking 1918 work using Cepheid variables to estimate the size of the Milky Way Galaxy and the sun's position within it as well as in 1953 proposing the "Liquid Water Belt" theory, now known as the concept of a habitable zone.
Read more about Harlow Shapley: Career, Institute On Religion in An Age of Science, Family, Honors, Quotes, Sources
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