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Historical models of the solar system
Hubble image of Ceres

Space Telescope Science Institute, Graphics Dept.

These simplified diagrams show an Earth-centered and a sun-centered solar system. In the ancient world, people thought that the sun and other objects orbited Earth (shown in the diagram at left). However, Polish astronomer Nicolaus Copernicus' models of a sun-centered solar system (shown in the diagram at right) ignited a change in that thinking in 1543.