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Doctors Medicines MCQs Q&A

  1. Gailileo Galilei
  2. Isaac Newton
  3. Tycho Brahe
  4. Johannes Kepler
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Option 4 : Johannes Kepler

The correct answer is Johannes Kepler.

  • Kepler's laws of planetary motion, published by Johannes Kepler between 1609 and 1619, describe the orbits of planets around the Sun.
  • The laws modified Nicolaus Copernicus' heliocentric theory, replacing its circular orbits and epicenters with elliptical trajectories, and explained how the velocities of the planets varied.
  • The three laws state that:
    • The orbit of a planet is an ellipse in which the Sun is at one of the two centers.
    • A line segment joining a planet and the Sun crosses equal areas during equal time intervals.
    • The square of a planet's orbital period is proportional to the cube of the length of the semi-major axis of its orbit.

  • Isaac Newton showed in 1687 that relationships like Kepler's would apply in the Solar System as a consequence of his own laws of motion and law of universal gravitation.
  • The elliptical orbits of planets were indicated by calculations of the orbit of Mars. 
  • The second law helps to establish that when a planet is closer to the Sun, it travels faster.
    • The third law expresses that the farther a planet is from the Sun, the slower its orbital speed, and vice versa.
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Related Questions

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