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Claudius Ptolemy was born in 100 AD and died in 160 AD and lived in Alexandria, Egypt. Claudius made a discovery of the "Geocentric Theory" or the "Ptolemaic System" which meant that he believed that the Earth was in the center of the galaxy.
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Nicolaus Copernicus was born in 1473 and died in 1543. He discovered the 'Heliocentric System' or 'Sun-Centered System'.
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Galileo was born in 1564 and died in 1642. He invented the telescope which was used to discovery the rings of Saturn.
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Johannes Kelper was born in 1571 and died in 1630. He was known for discovering three major laws of planetary motion.
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William was born in 1738 and died in 1822 and was known for discovering Uranus.
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The discovery of the first four asteroids was found in 1801, January 24.
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Joseph was born in 1811 and was known for discovering Neptune.
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Clyde was born in 1906 and died in 1997 and was known fo r discovering Pluto.
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The voyagers were sent to space in 1977 and was assigned to discover more about the giant planets of our solar system.
