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He is often considered the 'father of astronomy' as he was the one who created the modernized version of it.
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He contributed greatly to the understanding of the universe by making helpful inventions.
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made 'Kepler's Laws of Planetary Motion', an idea we still use today, though modernized.
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His biggest career moment was when he discovered Uranus in 1781.
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She was known as a sort of 'human computer' at Harvard's observatory.
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He is, of course, famous for the Hubble telescope that NASA still used to this day, but also he was the one who proved the galaxy is only one in a billion.
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He discovered the Kuiper's Belt theory
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He was one of the most famous modern astronomers.
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He's written a number of books full of theories and smartness.