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Period: 1500 to
Timeline of Astronomy
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1543
Copernicus proposes that the Earth spins on it's axis.
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1543
Nicolaus Copernicus proposes the heliocentric model, claiming that the Sun is at the center of the universe.
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Galileo Galilei creates the laws of motion, laying the foundation for Newton's laws.
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Galileo discovers that the tides are caused by the Sun and Moon.
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Kepler discovers that ALL the planets have elliptical orbits.
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Galileo improves the telescope to enhance the view.
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Johannes Kepler proposes the first laws of planetary motion.
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Issac Newton invents the reflecting telescope
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Newton develops his three laws of motion
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Newton develops the law of universal gravitation
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Albert Einstein develops the Theory of Special Relativity
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Einstein develops E=mc^2, which helps to explain how the large amount of energy causes the Sun and stars to shine
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Henrietta Swann Leavitt develops Leavitt's Law (Period-Lumosity Relation) which establishes the relationship between the period of pulsation and the absolute magnitude of Cepheid variable stars, which allows them to determine their distance from Earth.
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Einstein develops the Theory of General of Relativity
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Edwin Hubble discovers and proves that there are more galaxies beyond the Milky Way
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Hubble develops Hubble's Law which observes that galaxies are moving further apart.
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Stephen Hawking develops the area theorem (Black Hole Theory)
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Carl Sagan begins to promote the Search for Extra-Terrestrial Intelligence (SETI)
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Hawking develops the Cosmic Inflation Theory
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Carolyn S. Shoemaker discovers the Comet Shoemaker-Levy 9
