Astronomy study guide

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Across
  1. 3. this keeps planets in motion around the sun
  2. 7. named the rocky planet
  3. 9. the eighth planet from the sun
  4. 11. _______ are the result of the gravitational pull of the moon and sun on the surface waters of Earth
  5. 12. The _______ of the Earth causes day and night
  6. 13. like dirty snowballs
  7. 17. the seventh planet from the sun
  8. 18. sometimes called a shooting star
  9. 19. the sixth plant from the sun
  10. 21. The _______ of the moon are the result of the position the sun, the moon, and Earth are in relation to each other
Down
  1. 1. the fifth planet for the sun
  2. 2. large space rock that orbits the sun
  3. 4. The _______ of the Earth causes the angle that sunlight hits the surface to vary during the year
  4. 5. the closest planet to the sun
  5. 6. these planets are Farther from the sun, very large, and made of gas
  6. 8. the third planet from the sun
  7. 10. these planets are Closer to the sun, small, and rocky
  8. 14. this is the center of out solar system
  9. 15. the forth planet from the sun
  10. 16. Invention of the _______ provided powerful and confounding observations that challenged the Earth-centered model
  11. 20. the second closest planet to the sun