planets & moons

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Across
  1. 3. very reflective, smooth icy moon with cryovolcanoes
  2. 5. largest object with an aphelion exceeding 1000 AU
  3. 6. lowest density of any major moon
  4. 9. first known object to have rings outside the roche limit
  5. 15. surface area almost equal to texas & has one of the most varied topographies
  6. 16. only moon with a thicker atmosphere than earth's
  7. 17. first trans-neptunian object discovered to have rings
  8. 19. hottest object that could have permanent ice
  9. 21. most heavily cratered object
  10. 24. larger object in the largest binary system
  11. 25. known as the "death star moon" with a large crater
  12. 27. most volcanic moon
  13. 28. has 2 trojan/co-orbital moons along with itself, more massive than all smaller moons combined
  14. 30. object with strongest winds
  15. 31. second largest plutino
  16. 32. object with largest impact basin (crater)
Down
  1. 1. first trans-neptunian object named after a chinese diety
  2. 2. object with largest storm
  3. 4. most toxic atmosphere on a terrestrial object
  4. 5. largest rings on a planet
  5. 7. object only 4x the size of its only moon
  6. 8. smaller of the two potato moons, very low albedo
  7. 10. smallest body with precise measurements confirming hydrostatic equilibrium
  8. 11. first discovered asteroid belt object
  9. 12. second brightest kuiper belt object
  10. 13. biggest moon
  11. 14. #1 spot for the search for extraterrestrial life
  12. 18. larger of the two potato moons, will form a ring in 40 million years
  13. 20. first object discovered with a telescope
  14. 22. similar mass to earth's hydrosphere, has roughly equal parts ice & non-ice
  15. 23. has one hemisphere much darker than the other, has third tallest mountain
  16. 26. closest moon to the sun
  17. 29. largest object never visited with a spacecraft