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Which of the following statements about the movement of planets is true? A. A planet's orbit is elliptical with the Sun at one of two focal points. B. The orbit of a planet is circular with the sun in the center. C. The orbit of a planet is elliptical with another planet in one of the two center-points. D. The orbit of a planet is circular with another planet in the center. 

Which of the following statements about the movement of planets is true? A. A planet's orbit is elliptical with the Sun at one of two focal points. B. The orbit of a planet is circular with the sun in the center. C. The orbit of a planet is elliptical with another planet in one of the two center-points. D. The orbit of a planet is circular with another planet in the center.  Correct Answer A

The correct answer is A planet's orbit is elliptical with the Sun at one of the two focal points.

Important Points

  • Johannes Kepler gave the laws of planetary motion.
    • The orbit of every planet is an ellipse with the Sun at one of the two foci.
    • A line joining a planet and the Sun sweeps out equal areas during equal intervals of time.
    • The square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit.

 Additional Information

  • Newton's Gravitational law on Planets:
    • The first law describes how, once in motion, planets remain in motion.
    • The second law describes that to move in a curved path, a planet must have an acceleration toward the center of the circle.

Related Questions

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