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Ptolemy made the geocentric model of the universe.
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Halley was the first to calculate the orbit of a comet approaching Earth in 1531, 1607 and 1682 and later named after him. He concluded that these comets were actually the same and predicted they would come again in 1758.
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Polish scientist Nicolaus Copernicus proposed that the planets revolved around the sun.
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Kepler not only adamantly defended the idea that planets orbit the sun, but he also revealed that their paths were not perfect circles.
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Galileo Galilei improved telescopes and that led him to discover the moons of Jupiter and the rings of saturn.
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He discovered the planet Uranus.
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Ceres, 2 Pallas, 3 Juno and 4 Vesta
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Predicted by mathematical means the existence of the planet Neptune.
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discovered Pluto
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The Voyagers 1 and 2 were to conduct close-up studies of Jupiter and Saturn, Saturn's rings, and the larger moons of the two planets.
