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developed the helio-centric model of the universe
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discovered that planets orbited the sun in elliptical orbits
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proposed the laws of planetary motion
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theory of gravity, and how that keeps smaller objects orbiting around larger objects
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announced the invariability of planetary motions, meaning all planets have a unique but fixed orbit around the sun
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discovered the planet Uranus
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discovered about 2400 variable stars, which was crucial to measuring distances to different bodies in space
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proposed the theories of relativity, which allowed us to further understand the universe
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made further predictions on the expansion of the universe
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estimated the size of the universe and where the centre of the universe is
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through observations of red-shifting, discovered the universe is expanding
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proposed the big bang theory, suggesting everything in the universe originated from a single atom
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discovered that a lot of elements on earth originated from inside stars
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discovery of cosmic microwave background radiation