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4-1 Ancient astronomers invented geocentric models to explain planetary motions
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4-2 Nicolaus Copernicus devised the first comprehensive heliocentric model
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4-3 Tycho Braheâs astronomical observations disproved ancient ideas about the heavens
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4-4 Johannes Kepler proposed elliptical paths for the planets about the Sun
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4-5 Galileoâs discoveries with a telescope strongly supported a heliocentric model
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4-6 Newton formulated laws of motion and gravity that describe fundamental properties of physical reality
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4-7 Describing orbits with energy and gravity
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4-8 Gravitational forces between Earth and the Moon produce tides
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