Word: earth
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Dates: during 1930-1939
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...first conception of the universe was a geocentric one, and in the sixteenth century Copernicus made the first great step in astronomical research by overturning this old theory in favor of a heliocentric one which held that the earth and the planets went around the sun. In 1902, a man named Kapteyn put forth the theory that the sun was the center of things and that the stars were scattered about it. This Kapteyn Universe, as it was called, was in good standing till 1917 when Dr. Shapley found that we were not the center of things after...