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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 hirpachus start classifying stars according their brightness.
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the big bang was a big explotion of a small point of energy that created the matter
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was invented by ptolemy that the model tell us that the planets and sun was revolve around earth
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was invented by copernicus that tell us that the planets revolve around earth
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galileo used a telescope for first time to observe the night sky.
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he built the first telescope using mirrors instead of lenses.
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w. herschel discoverd uranus
