AST201H1 Lecture Notes - Lecture 20: Semi-Major And Semi-Minor Axes, Orbital Period, Vera Rubin
17 Mar 2019
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Johannes kepler: had worked from tycho bache"s data and came up with an accurate description of the motion of the planets. #1: planets orbit the sun in an elliptical pattern, with the sun at one focus. #2: planets trace out equal area in equal time. #3: a planet"s orbital period depends on its distance from the sun as p^2 = a^3. Presented the idea of force and the laws of motion. His law of gravitation showed how kepler"s laws could be applied universally. There"s a force between any two objects in the universe. The force is proportional to the product of the masses of each object. The force is inversely proportional to the square of the distances. The force depends on the mass of the first object multiplied by the mass of the second object. If you double the mass of either object, you double the force. If you half the mass of either object, you half the force.
