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1543
An astronomer by the name of Nicolaus Copernicus published a book containing the first theories on a heliocentric system

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1608 Hans Lippershey makes the refracting telescope

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1610 Galileo Galilei discovers craters on the moon,4 satellites of Jupiter,and spots on the sun thus debunking the myth that was the geocentric system

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1687 Isaac Newton publishes his first copy of the book Philosophiae Naturalis Principia Mathematica,explaining Kepler's laws of planetary motion

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1781 An amateur at the time, William Herschel discovers Uranus mistaking it for a comet at first

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1846 Johann Gottfried Galle while searching in in a position given to him by Urbain Le Verrier and finds Neptune

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1895 Konstantin Tsiolkovsky publish articles saying that the rocket will work in the vacuums of space,giving hope for possibility of space flight

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1926 Robert Goddard's rocket which is the the first to use liquid fuel, is demonstrated and is shown to work in a vacuum, and breaks the sound barrier

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1957  The US launches Explorer 1 into space

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1957  The US launches Explorer 1 into space

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1958 NASA is created to catch up with Soviet space technologies and absorbs the NACA which was founded in 1915

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1958 NASA is created to catch up with Soviet space technologies and absorbs the NACA which was founded in 1915

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1968 Apollo 8 manages to make it past Earth's gravitational pull,orbit the moon,and make it back safely

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1968 Apollo 8 manages to make it past Earth's gravitational pull,orbit the moon,and make it back safely

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2006 IAU changed the definition of a planet,making another class called dwarf planets were also made.Pluto,Ceres,and Eris were changed to dwarf planets.

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2006 IAU changed the definition of a planet,making another class called dwarf planets were also made.Pluto,Ceres,and Eris were changed to dwarf planets.

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2016 Juno the satellite was launched in 2011 and reaches Saturn in 5 years

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2016 Juno the satellite was launched in 2011 and reaches Saturn in 5 years