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Ptolemy was an astronomer and mathematician. He believed that the Earth was the center of the Universe. The word for earth in Greek is geo, so we call this idea a "geocentric" theory.
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Nicolaus Copernicus formulated a model of the universe that placed the Sun rather than the Earth at the center of the universe.
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his discovery of the four most massive moons of Jupiter, now known as the Galilean moons.
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He was the second Astronomer Royal in Britain, succeeding John Flamsteed in 1720. From an observatory he constructed on Saint Helena, Halley recorded a transit of Mercury across the Sun.
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Johannes Kepler discove Kepler's three laws of planetary motion
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William Herschel Discovered Uranus
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Piazzi named it after Ceres, the Roman goddess of agriculture. Three other asteroids (2 Pallas, 3 Juno, and 4 Vesta) were discovered over the next few years, with Vesta found in 1807.
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Urbain Le Verrier discovered Neptune
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discovered Pluto
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Voyager 1 is a space probe launched by NASA on September 5, 1977. Part of the Voyager program to study the outer Solar System, Voyager 1 launched 16 days after its twin, Voyager 2.