Solar Systems

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Across
  1. 7. the planet where it rains sulfuric acid
  2. 8. rocky leftovers of planet formation
  3. 9. earth's only natural satellite
  4. 12. how many planets are in the solar system
  5. 13. the coldest planet in the solar system
  6. 15. where humans reside
  7. 16. force that attracts our body to the center of the earth
  8. 17. the center of the solar system
Down
  1. 1. a celestial body moving in an elliptical orbit around a star
  2. 2. the lightest planet in the solar system
  3. 3. classified as a dwarf planet in 2006
  4. 4. the biggest planet in the solar system
  5. 5. the planet closest to the sun
  6. 6. make their own light
  7. 10. the planet with the strongest winds
  8. 11. to follow a curved pat around a planet or star
  9. 14. also called the "red planet"