Universal Gravitation History
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8 Terms
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Ptolemy, Copernicus, Galileo, Brahe, Kepler
Order of scientists
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Ptolemy
Greek mathematician, Geocentric Universe theory, Circular orbits
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Copernicus
Heliocentric Universe theory, Circular orbits
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Galileo
Used teliscope to gather data to support the Helicentric theory, Circular orbits
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Brahe
Gathers precise measures on the position of the planets
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Kepler's 1st Law
Orbits of planets are elliptical with the sun at one of the foci
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Kepler's 2nd Law
Planets cover the same area of space in the same amount of time; Closer to the sun -> faster it moves
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Kepler's 3rd Law
(Ta/Tb)^2 = (ra/rb)^3
Note 
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