Harlow Shapley Quotes

Harlow Shapley was born in Nashville, Missouri, USA. He was an American astronomer. He used RR Lyrae stars to correctly estimate the size of the Milky Way Galaxy and the sun's position within it by using parallax. In 1953 he proposed his "liquid water belt" theory, now known as the concept of a habitable zone. Post-graduation, he received a fellowship to Princeton University for graduate work, where he studied under Henry Norris Russell and used the period-luminosity relation for Cepheid variable stars to determine distances to globular clusters.