Solar System

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Across
  1. 3. the invisible line the Earth spins on
  2. 4. the planet with a thin atmosphere, canyons & riverbeds
  3. 5. the outer planets
  4. 6. if the northern hemisphere is tilted toward the Sun, what season is the southern hemisphere experiencing
  5. 8. the spinning motion the Earth does that causes day & night
  6. 9. the amount of time it takes the Earth to rotate
  7. 10. how long does a moon phase take to complete
  8. 11. when the entire moon is illuminated
  9. 14. to light up
  10. 16. the planet that looks like our moon and is the smallest
  11. 20. the mnemonic device to remember the size order of planets
Down
  1. 1. when the right side of the moon is illuminated
  2. 2. the inner planets that are made from rock
  3. 7. when none of the moon is illuminated
  4. 12. the mnemonic device to remember the order of the planets
  5. 13. the planet that has a cloud blanket that traps thermal energy
  6. 15. the circular motion the Earth does that causes seasons
  7. 17. the amount of time it takes for the Earth to revolve
  8. 18. if the southern hemisphere is tilted toward the Sun, what season is the northern hemisphere experiencing
  9. 19. Quarter when the left side of the moon is illuminated