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Hans Lippershey, invents the telescope
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Kepler's First and Second Laws of Planetary Motion
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The first reflecting telescope was built by Newton.
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Albert Einstein introduces his general Theory of Relativity.
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Sputnik, first object to orbit the Earth, was launched by the Russians.
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Space Shuttle Challenger disaster
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Galileo space probe reaches Jupiter.
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Cassini begins its journey to Saturn.
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Scientists discover the real Hubble Constant
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The Near spacecraft reaches asteroid Eros.