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Cladius Ptolemy proposed the geocentric model of the Universe
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Nicolaus Copernicus proposed the heliocentric model of the solar system.
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Made the three laws of planetary motion
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He improved the telescope and discovered that Saturn had rings.
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Discovered Halley's Comet
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Credited as the founder of sidereal astronomy
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Predicted the position of Neptune with only maths
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Discovered Pluto
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Studied the outer Solar System
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Studied Uranus and Neptune, as well as the outer Solar System
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