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it hapened 13.8 billions of years ago and creats our universe.
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suggested that the Earth revolved around the sun.
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the greek astronomer that cassified 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 heliocentric model
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carried out very detailed observation of the planets.
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used a telescope r the first time to observe the night sky
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built the first telescope using mirrors instead of lenses.
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the principles of natural philosophy in wich he explained the laws governing the movement of planets.
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explain Newton's laws annd predicted the return of the comet
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measured the distance from a star for the first time using geometric methods.
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descover neptune.
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proved that someone of the nebulas seen in the sky are in fact independent galaxies.
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discover the planet Pluto
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the discover of the first extra-solar planet
