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8 July, 19:49

Which contributions did Johannes Kepler make? Check all that apply. He revived Aristotle's model of the solar system. He solved Ptolemy's model by proving elliptical orbits. He proved Galileo's calculations were incorrect. He determined that planets move faster when closer to the Sun. He discovered laws of planetary motion.

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  1. 8 July, 20:47
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    He solved Ptolemy's model by proving elliptical orbits.

    He determined that planets move faster when closer to the Sun.

    He discovered laws of planetary motion.

    Explanation:

    The laws of planetary motion were published by Johannes Kepler. The first law tells us that all planets move around the Sun describing elliptical orbits, with the Sun at one of the two foci. The second law tells us that planets travels faster when closer to the Sun, then slower when farther from the Sun. The third law tells us that the square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit.
  2. 8 July, 21:16
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    The correct answers are: Options 2,4 and, 5

    2) He solved Ptolemy's model by proving elliptical orbits.

    4) He determined that planets move faster when closer to the Sun.

    5) He discovered laws of planetary motion.
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