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Ptolemy was an astronomer and mathematician. He believed that the Earth was the centre of the Universe.
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Nicolaus Copernicus formulated a model of the universe that placed the Sun rather than the Earth at the centre 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 discover Kepler's three laws of planetary motion.
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William Hershel 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 1802
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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 outer Solar System. Voyager 1 launched 16 days after its Voyager 2