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propposed a model of the earth with the sun in the middle.
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created angle measuring dence
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decriptions of the behavior of moving objects
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discovered four of saturns moons
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first to formulate and test the low of universal gravitation
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developed a mechanical explantion for planetary motion
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documented obervations of mercury
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discovered uranus
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classified 225,000 stars
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theory of relativity
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1 of the pioneers i the search for extrater restiral
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well known scientist during the 1970's 80's
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author of several populars science books and black holes
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established the field of extra galatic astronomy
