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Galileo used the telescope to look at celestial objects and record his discovery
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Keplers first and second law of planetary motions.
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Cassini discovers Saturns rings
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Piazzi discovers first ateroid, Ceres
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Great Red Stop on Jupiter is prominent.
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The Mount Willson Observatory is established for study of the sun
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Hertzsprung descirbes giant and Red Drawfs.
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Robert Goddard beigns practical rocketry
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Albert Einstein introduces the Theory of Relativity
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Sputnik is launched into space by the Russians