gravity puzzle

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Across
  1. 4. made by Issac Newton
  2. 5. to circle something
  3. 8. made the law of universal gravitation
  4. 10. what keeps us on the ground
Down
  1. 1. what we live on
  2. 2. amount of matter in someone
  3. 3. orbits the earth
  4. 6. what stops the earth from going into the sun
  5. 7. something gravity is affected by
  6. 9. orbited by all planets