Review

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Across
  1. 2. Come from comets
  2. 4. What does the Earth spin on?
  3. 6. Smallest out of all gas giants
  4. 9. Ellipse shape
  5. 10. amount of light received on earth
  6. 13. Second planet from the sun
  7. 15. Second largest
  8. 16. Lava flowing up to cracks
  9. 17. closest to the sun
Down
  1. 1. Group of stars
  2. 3. Revolves around earth
  3. 5. Great red spot
  4. 7. First to formulate and test the law of universal gravitation
  5. 8. Dust, rock, water, and gas
  6. 11. Piece of rock, orbits suns
  7. 12. Fourth planet from the sun
  8. 14. Axis rotation is tilted on its side and it spins backwards