Planetary Moons

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Across
  1. 3. moon of Saturn with an atmosphere
  2. 4. largest of Pluto's moons
  3. 5. moon of Saturn that looks like the Death Star
  4. 6. discovered the 4 main moons of Jupiter
  5. 7. moon of Saturn that is oddly-shaped & colored
  6. 10. moon of Neptune with retrograde motion
  7. 11. smaller of Mars' 2 moons
  8. 13. largest moon in the solar system
  9. 14. the largest of Uranus's moons
Down
  1. 1. ice-covered moon of Jupiter with underground ocean
  2. 2. moon of Jupiter that is heavily cratered
  3. 4. spacecraft that studied Saturn and its moons
  4. 8. larger of Mars' 2 moons
  5. 9. moon of Uranus with wildly varied topography
  6. 12. moon of Saturn with erupting geysers
  7. 15. most volcanically active place in the solar system