Orbital Forces

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Across
  1. 3. the planet we live on
  2. 6. move in a circle
  3. 9. the outside layer
  4. 11. a thought
  5. 12. an free area or room
  6. 13. a luminous point in the sky
  7. 14. a region of the solar system beyond Neptune
  8. 16. earths natural satellite
  9. 19. the action of rotation
  10. 20. the extremely hot center of earth
Down
  1. 1. the distance from north to south
  2. 2. the length of a line from each edge
  3. 4. a place where something has been placed
  4. 5. the force that attracts two together
  5. 7. an invisible line that an object rotates on
  6. 8. an icy small planet
  7. 10. pieces of rock floating space
  8. 12. a set of things
  9. 15. an evolution of revolving
  10. 17. the curved path of a spacecraft
  11. 18. the biggest star