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The greek astronomer Aristarchus of Samos suggested that the Earth revolved around the sun
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the greek astronomer hiparchus classified the stars according to their apparent brightness
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Ptolemy suggested a gencentric model.according to him the sun,the moon and the 5 known planets all revolved around the sun
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Galileo used a telescope for a first time to observe the night sky
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Isaac Newton built the first telescope using mirrors insted of lenses
