Planets Mars - Dwarf Pluto

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Across
  1. 3. Packed tightly together and often heavy, like a metal ball.
  2. 4. King of the planets
  3. 5. Jupiter's biggest moon
  4. 6. The red planet
  5. 9. Pluto's largest moon
  6. 11. What Martian soil is made of (mostly)
  7. 12. Discovered 4 of the biggest moons of Jupiter (among other things)
  8. 14. Lonely dwarf planet
  9. 15. An 11-year old girl from England who named Pluto
  10. 17. What Jupiter and Saturn and Uranus are are mostly made of
  11. 18. What you need to see Saturn's rings
Down
  1. 1. The ringed planet
  2. 2. A giant storm on Jupiter
  3. 6. A volcano on Mars
  4. 7. A body that orbits a star, is mostly round, but hasn't cleared all of the objects out of its orbital path.
  5. 8. The god of this is what Mars is named for.
  6. 10. What an astronomer wanted to name Uranus
  7. 13. Sideways spinner
  8. 16. Big Blue
  9. 19. A space probe that studied Saturn