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Claudius Ptolemy created the Algamest, his model of the universe
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Nicolaus Copernicus relized that the Earth obits around the sun
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Giordana suggest neither earth or sun is the center of the universe and that the sun is just one of many stars of a large universe
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Tycho Brache proposes that the sun revolves around the earth and the other planets orbit the sun
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Johannes Kepler posits the three laws of planitary motion
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Galileo builds his first telescope
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Issac Newton publishes Mathematical Principles of Natural philosophies
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Steller Parallax was believed to not exist
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Friedrich Wilhelm proves steller parallax by watching a star move in the sky
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Albert eintsein presents the General theory of relativity
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Cephid stars are found in the andromida galaxy
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Georges lemaitre presents an early version of the big bang theory
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Edwin hubble discovers hubble law.
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Fritz Zwicky discovers indications of Dark matter
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George Gamow publishes The Orgin of Chemical Elements
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Fred Hoyle revises the big bang
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Astronomers discover Cosmic microwave backround radiation
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Vera Rubin and Kent Ford find that dark matter exerts a gravitational pull on stars
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The COBE satelklite shows that cosmic microwave backround is the remnant heat of the early univcerse
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Reasearchers learn that the universe is expanding due to dark energy
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The Wilkinson Microwave Anistropy Probe finds that matter was not evenly distributed from the big bang
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Maps of the universe reveal that galaxies are uneven.
