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Kepler's 3rd law
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'''Johannes Kepler''' (b. 1571) ''''' Kepler's laws of planetary motion''''' 1609-1619 The square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit. : <math>T^2 \propto a^3</math> == Resources: == *[https://en.wikipedia.org/wiki/Kepler's_laws_of_planetary_motion#Third_law_of_Kepler Kepler's 3rd law] == Discussion: == [[Category:Pages for Merging]]
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