Planetary Puzzle

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Across
  1. 4. Volcanic moon of Jupiter.
  2. 5. Closest planet to the sun.
  3. 7. Moon with geysers of water vapor.
  4. 10. Red planet with two moons.
  5. 11. Neptune's largest moon.
  6. 12. Farthest planet from the sun.
  7. 15. Saturn's largest moon.
Down
  1. 1. Largest moon in the solar system.
  2. 2. Largest planet in our solar system.
  3. 3. Moon with a subsurface ocean.
  4. 6. Second planet from the sun.
  5. 8. Third rock from the sun.
  6. 9. Ringed gas giant.
  7. 13. Dwarf planet with a heart-shaped region.
  8. 14. Seventh planet in our solar system.