Astronomy

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