Beyond Earth

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Across
  1. 3. closer to the sun warmer mostly rock
  2. 5. when a planet spins on its axis
  3. 7. heavily cratered rock, ice crust, ice mantle, rock core
  4. 10. sixth planet in order, ringed, very low density
  5. 11. probes that found new information about outer planets
  6. 12. The earth and other planets revolve around the sun
  7. 16. the sun and planets make up this
  8. 17. the way planets revolve around the sun
  9. 19. second planet to the sun, atmosphere thick and toxic
  10. 20. largest known volcano in the solar system
Down
  1. 1. largest planet in solar system and fifth planet in order
  2. 2. 4 gaseous planet
  3. 4. largest moon in solar system
  4. 6. the gas or air that surrounds the planet
  5. 8. Vast disks of icy comets, located near Neptune's orbit
  6. 9. third planet from sun, water exists as 3 states of matter
  7. 13. farthest from the sun mostly gaseous planets
  8. 14. last of gas planet, orbit overlaps Pluto's, dark spot, bluish tint
  9. 15. the orbit at which a planet spins around the sun
  10. 18. smallest planetoid to the sun , different orbital plane tilted 17 degrees
  11. 21. closest planet to the sun, weak magnetic field
  12. 22. smallest gas planet,7th planet ,bluish tint, spins like tire
  13. 23. fourth planet from the sun, red planet, surface iron oxide dust