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Published his heliocentric model. The Sun, the moon and the 5 known planets revolved around the Sun.
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He used a telescope for the first time to observe the sky. This was the birth of modern astronomy
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He built the first telescope using mirrors instead of lenses
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He published his book The Principles of Natural Philosophy in which he explained the laws govering the movement of planets
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He explained Newton´s laws and predicted the return of the comet in 1758
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He discovered the planet Uranus
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He meassured the distance from a star for the firt time using geometric methods. This proved that Earth follows an orbit around the Sun as Copernicus suggested.
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He proved that some of the nevulas seen in the sky are in fact independent galaxies. He discovered that the galaxies move away from each other.
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He discovered Pluto
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The discovery of the first extra-solar planets
