According to mediaeval European cosmology, the Earth lay at the center of the universe, while the stars were points of light on a tremendous sphere that surrounded the world, to which all the other planets and heavenly bodies, including Earth's moon, were attatched. The sphere rotated around the Earth, thus producing the movement of the planets and stars. This sphere was called the Primovant.

This explanation of the workings of the universe was accepted until Galileo Galilei disputed it in the early 1600s. He was jailed as a heretic by the Catholic Church, of course, since the idea that the Earth lay at the center of the universe was the basis for so much Catholic theology.

The Catholic Church admitted that Galileo was correct in 1992, some two hundred and fifty years after everyone else.

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