Another similarity , this one between Jupiter and the Earth, was furnished by Galileo's discovery of four satellites of Jupiter, similar to the Earth's single moon. How would they possibly fit into the system of spheres used by everyone since Plato? Galileo considered the "four planets never seen from the creation of the world up to our own time" to be his most important discovery. Here we have a fine and elegant argument for quieting the doubts of those who. .. are mightily disturbed to have the Moon alone revolve about the Earth and accompany it in an annual rotation about the Sun. . .. our own eyes show us four stars which wander around Jupiter as does the Moon around the Earth, while all together trace out a grand revolution about the Sun. .. —Galileo Galilei In 1613, in a long unpublished letter, Galileo began arguing that scripture and Copernicanism
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