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The Big Bang was an expltion that created the universe ,it happened 13.8 billon of years
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The Greek astronomer Aristarchus suggested that the Earth revolded around the Sun
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The greek astronomer Hiparchus classified the stars according to their apparent brightness
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Ptomely suggested the geocentric model=the Sun,the Moon,and the 5 planets all revolved around the Earth .
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Copernicus published his heliotic model according to wich the planets revolved around the Sun
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Galileo used a telescope for the first time to observe the night sky .This as the bright of modern astronomy
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Isaac Newton built the first telescope using mirrors insted of lenses
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Newton publish his book The Principles of Natural Philosofy in wich he explained the laws governing th emovment of the planests
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Edmund Halley explained Newton´s laws and predicted the return of the comet in 1758
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W. Herschel discoverd the planet Uranus
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F. W. Bessel measured the distance from a star for the first time using geometric methods.This provedthe heliotic theory
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Adams,Galle,and Leverrier discovere Neptune
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E. P. Hubble preved tat some nebulas seen skyare in fact independent galaxies,then he discovered that the galaxies move away from each other
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C. Tombaugh discovered Pluto
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The discovering of the first extra solar system
