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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 is a formulated a model of the universe that placed the sun rather than the earth in 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. HAlly recoreda transit of Mercury and the Sun.
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Johannes Kepler discovered 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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He discovered Neptune
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He 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 in 16 days, after its twin, Voyager 2