Gravity in the Solar System

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Across
  1. 5. The moon orbits earth in the prograde direction and completes one revolution relative to the Vernal Equinox
  2. 7. A unit of astronomical distance equivalent to the distance that light travels in one year
  3. 11. Unit of measurement equal to 149.9 million kilometers
  4. 13. What is used for judging, evaluating, or selecting something
  5. 15. To make minor changes
  6. 16. A limit or restriction
  7. 17. A large spiral system of about several hundred billion stars one of which is the sun
Down
  1. 1. A celestial body orbiting the earth or another planet
  2. 2. The force that attracts a body toward the center of the earth
  3. 3. The collection of eight planets and their moons in orbit around the sun together with smaller bodies in the form of asteroids, meteoroids and comets
  4. 4. The natural satellite of the earth visible by reflected light from the sun.
  5. 6. Energy in the form of heat
  6. 8. The curved path of a celestial object or spacecraft around a star, planet, or moon especially a periodic elliptical revolution
  7. 9. A small rocky body orbiting the sun
  8. 10. Celestial object consisting of a nucleus of ice and dust and when near the sun a tail of gas and dust particles
  9. 12. A system of millions or billions of stars together with gas and dust held together by gravity
  10. 14. All existing matter and space considered as a whole; the cosmos