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The Big Bang probably occurred.
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The Big Bang probably occurred.
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Egypt and Mesopotamia First solar-lunar calendars
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China Chinese astronomers observe supernova in Taurus.
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Copernicus publishes his heliocentric theory of the Universe.
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Hans Lippershey, a Dutch spectacles maker invents the telescope.
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The discovery of Uranus by Herschel
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Hubble shows that galaxies exist outside the Milky Way galaxy.
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First radio telescope built by Grote Reber.
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Sputnik, first object to orbit the Earth, launched by the Russians.
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Yuri Gagarin becomes the first man in space!
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