Clockwise from top left is a collage of Kepler, Copernicus, Newton, Galileo, Descartes, and Ptolemy. (Images courtesy of the Library of Congress and NASA.
Clockwise from top left is a collage of Kepler, Copernicus, Newton, Galileo, Descartes, and Ptolemy. (Images courtesy of the Library of Congress and NASA.
从左上顺时钟方向依序为：克卜勒，哥白尼，牛顿，伽利略，笛卡儿，托勒密。（图片来源：美国国会图书馆及美国太空总署。）