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Published three laws of motion.
Published laws of gravity. -
Discovered Uranus
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The first placing of astronomy on a modern mathematical basis
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Discovered a means by which astronomers became better able to accurately measure extra galactic distances known as the period-luminosity relation.
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Discovered that the sun lies near the central plane of the Milky Way Galaxy and is not at the center, but at 30,000 light-years away.
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Proved the existence of galaxies other than our own Milky Way
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Steady State theory, the story of cosmological discovery was an important role in the acceptance of the Big Bang theory.
Answered the question: how did the heavier elements come into being? -
Published a prediction that if the universe were created in a Big Bang, today we would see the glow of light that was released when atoms first formed.