solar system crossword

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Across
  1. 5. the average distance between Earth and the Sun
  2. 7. the path that an object with mass in motion follows through space as a function of time.
  3. 13. a line segment that is at right angles with the semi-major axis and has one end at the center of the conic section
  4. 14. any object that orbits a planet, star, or moon
  5. 15. an invisible line around which an object rotates, or spins.
  6. 16. the longest semidiameter or one half of the major axis
  7. 17. A measure of the deviation of an elliptical path, especially an orbit, from a perfect circle
  8. 18. the circular movement of an object around a central line
Down
  1. 1. the proportionality constant connecting the gravitational force between two bodies with the product of their masses and the inverse square of their distance.
  2. 2. a point of convergence of light or other electromagnetic radiation, particles, sound waves, etc, or a point from which they appear to diverge
  3. 3. A closed curve consisting of points whose distances from each of two fixed points all add up to the same value
  4. 4. the curved path of a celestial object or spacecraft around a star, planet, or moon, especially a periodic elliptical revolution.
  5. 6. The motion of an object around a point, especially around another object or a center of mass.
  6. 8. the force that pulls two masses toward each other.
  7. 9. the interval of time it takes for a motion to repeat.
  8. 10. a mixture of gases that surrounds the Earth
  9. 11. the point in the orbit of a planet, comet or other body most distant from the Sun.
  10. 12. the point in the orbit of a planet or other astronomical body, at which it is closest to the sun.