Astronomy Unit Exam

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Across
  1. 2. space rock that orbits the sun
  2. 5. the theory that explains how our moon was formed
  3. 7. the force that governs all movement in the universe
  4. 8. the largest planet
  5. 10. top layer of the sun
  6. 11. the greater the ________ the weaker the gravitational force
  7. 14. space rock that hits the Earth's surface
  8. 15. how many stars are in our solar system
  9. 16. smallest planet closest to the sun
  10. 19. process of a star making energy where hydrogen is turned into helium
  11. 20. space rock that burns up completely in our atmosphere
Down
  1. 1. moon phase when the sun, Earth and moon make an L shape
  2. 3. movement of Earth on its axis
  3. 4. first day of winter (December 20-23)
  4. 6. the distance between the Earth and the sun
  5. 9. moon is between the sun and the Earth and the moon's shadow falls on the Earth
  6. 12. center of the sun
  7. 13. first day of spring (March 20-23)
  8. 17. movement of planets around the sun
  9. 18. Earth is between sun and moon and sun's light not reaching the moon