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3-1 Astronomers of antiquity used observation and reasoning to develop astonishing advances in the study of astronomy
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3-2 Nicolaus Copernicus devised the first comprehensive Sun-centered model
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3-3 Galileoâs discoveries of moons orbiting Jupiter and the phases of Venus strongly supported a heliocentric model
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3-4 Johannes Kepler proposed that planets orbit the Sun in elliptical paths, moving fastest when closest to the Sun, with the closest planets moving at the highest speeds
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3-5 Isaac Newton formulated three laws relating force and motion to describe fundamental properties of physical reality
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3-6 Newtonâs description of gravity accounts for Keplerâs laws and explains the motions of the planets
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