Gravity and the Solar System

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Across
  1. 3. when on object goes around another object
  2. 6. the collection of stars and planets that surrounds the sun which is in the center
  3. 8. the name of our galaxy
Down
  1. 1. the force of attraction between any 2 objects
  2. 2. the path planets and moons take as they revolve
  3. 4. the amount of space between 2 objects
  4. 5. the celestial objects that orbit the sun
  5. 7. the amount of matter in a space