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he suggested that the Earth revolved around the sun
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Classified the stars according to their apparent brightness
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Suggested a geocentric astronomic model. According to him, the sun, the moon and the five known planets ( Mercury, Venus ,Mars, Jupiter, and Saturn) all revolved around the Earth.
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Published his heliocentrical model according to which the planets revolved around the sun.
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Carried out very delaited observation of the planets. Kepler deduce his famous planetary laws following Brahe´s observation.
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Used a telescope for the first time to observe the night sky. This was the birth of of modern astronomy
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Built the first telescope using mirrors instead of lenses
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Newton published his book The Principles of Natural Phylosophy in which he explained the laws governing the movement of the planets.
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He explained Newton´s laws and predicted the return of the comet ( which was to carry his name) in 1758
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Discovered the planet Uranus
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Measured the distance from a star for the first time using geometric methods. This in turn, definitively proved that Earth follows an orbit around the Sun as Copernicous suggested.
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They discovered Neptune
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The birth of the science Astrophysics thanks to the spectroscope, an apparatus which allows us to identify substances in the stars .
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proved that some of the nebulas seen in the sky are in fact independent galaxies. He then discovered that the galaxies move away from each other.
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Discoverede the planet pluto
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The discovered of the extra solar planet
