Keplar's laws crossword 2

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Across
  1. 3. States that planets move in elliptical orbits with the Sun at one focus.
  2. 4. A unit of measurement equal to the average distance between the Earth and the Sun.
  3. 5. One of two fixed points in an ellipse. In a planetary orbit, one focus is occupied by the Sun.
  4. 7. The amount of matter in an object; a key factor in gravitational attraction.
  5. 9. The square of a planet’s orbital period is proportional to the cube of the semi-major axis of its orbit (T² ∝ a³).
  6. 10. Half of the longest diameter of an ellipse; represents the average distance from a planet to the Sun.
  7. 12. A line between a planet and the Sun sweeps out equal areas during equal intervals of time, meaning planets move faster when closer to the Sun.
  8. 13. space between the centers of two objects; gravitational force decreases as distance increases.
  9. 14. The attractive force between two objects with mass. It is proportional to the product of their masses and inversely proportional to the square of the distance between them.
  10. 15. The time it takes an object to complete one full orbit around another object.
Down
  1. 1. The tendency of an object to resist a change in motion; helps balance the pull of gravity to keep planets in orbit.
  2. 2. States that every mass attracts every other mass in the universe, and the force is given by the equation:
  3. 6. The curved path of a celestial object or spacecraft around a star, planet, or moon, especially a periodic elliptical revolution.
  4. 8. A force that acts on a body moving in a circular path and is directed toward the center of the circle (gravity provides this force in orbits).
  5. 11. An elongated circle or oval shape; the shape of planetary orbits according to Kepler’s First Law.