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1. State Kepler's three laws. |
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Answer» There are actually three, Kepler’s laws that is, of planetary motion: 1) every PLANET’s orbit is an ellipse with the Sun at a focus; 2) a line joining the Sun and a planet SWEEPS out equal AREAS in equal TIMES; and 3) the square of a planet’s orbital PERIOD is proportional to the cube of the semi-major axis of its orbit. As it’s the third which is most often used, Kepler’s law usually means Kepler’s third law (of planetary motion). |
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