Astronomy

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Across
  1. 3. caused by the moon's gravity
  2. 4. field protects the earth from cosmic radiation
  3. 6. the wobble of the earth on its axis
  4. 10. the point where two objects balance each other as they revolve
  5. 12. motion of a planet on its axis
  6. 15. the moon's gravity _____ the tilt of the earth
  7. 16. heats and cools faster than water
  8. 18. caused by the moon's pull on the earth as it spins
Down
  1. 1. the closer to the sun, the ____ the planet moves
  2. 2. heat energy from the sun
  3. 5. discovered laws of planetary motion
  4. 7. energy during photosynthesis
  5. 8. energy made in the sun by fusing hydrogen atoms
  6. 9. caused by the tilt of the earth's axis
  7. 11. plantes revolve in these shapes, not circles
  8. 13. ______cubed equals time squared
  9. 14. motion of the earth around the sun
  10. 17. most widely accepted theory of the origin of the universe