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13,000 BCE
Bing Bang
Sometime between 13 and 20 billion years ago. The center of the Universe. The Big Bang probably occurred. -
280 BCE
Aristarchus suggests the Earth revolves around the Sun.
He provides first estimation of Earth-Sun distance. -
240 BCE
Eratosthenes measures the circumference of the earth with surprising accuracy!
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130 BCE
Hipparchus develops the first acccurate star map and star catalogue with over 850 of the brightest stars.
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140
Ptolemy suggests geocentric theory of the universe
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Sep 13, 1543
Copernicus publishes his heliocentric theory of the Universe.
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Galileo uses telescope for astronomical purposes
He discovers 4 Jovian moons, the Moon's craters and the Milky Way galaxy. -
Kepler's First and Second Laws of Planetary Motions are announced.
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The Third Law of Planetary Motion is announced by Kepler in his work Harmonice Mundi
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Christian Huygens discovers Saturn's rings and Titan, the fourth satellite of Saturn.
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The discovery of Uranus by Herschel
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Piazzi discovers first asteroid, Ceres.
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Sputnik
First object to orbit the Earth, launched by the Russians. -
U.S.A. Explorer 1 launched
This was the first U.S. satellite to orbit the Earth. -
Yuri Gagarin becomes the first man in space!
