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Two competing models attempt to explain the motions and changing brightness of the planets: Ptolemy's geocentric model and Copernicus' heliocentric...

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.

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