Two competing models attempt to explain the motions and changing brightness of the planets: Ptolemy's geocentric model and Copernicus' heliocentric model. Sort the characteristics according to whether they are part of the geocentric model, the heliocentric model, or both solar system models. Drag the appropriate items to their respective bins. View Available Hint(s)

Geocentric theory proposes that all objects including the moon, sun, stars orbit around the Earth while the heliocentric theory proposes that all other objects including the Earth, moon, and stars move around the Sun

Explanation:

The heliocentric model also makes it look like the faster planets are making the slower planets seem to move backwards. The geocentric model uses a system of epicycles to explain retrograde motion, whereby the planets moved around small circular paths that in turn moved around larger circular orbits around the Earth.

This model positioned the Sun near the center of the Universe, motionless, with Earth and the other planets orbiting around it in circular paths, modified by epicycles, and at uniform speeds. The Copernican model displaced the geocentric model of Ptolemy that had prevailed for centuries, which had placed Earth at the center of the Universe. Copernican heliocentrism is often regarded as the launching point to modern astronomy and the Scientific Revolution.

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