Merry Christmas, Josh!

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Across
  1. 5. Josh's Christmas present
  2. 6. This planet orbits sideways
  3. 8. was stripped of its title in 2006; now a dwarf planet
  4. 11. A mammal that lays eggs
  5. 12. Flying mammal
Down
  1. 1. Large marsupial
  2. 2. the largest known volcano, Olympus Mons, is on this planet
  3. 3. planet closest to the sun
  4. 4. this mammal poops cubes
  5. 7. slugs have this many noses
  6. 9. The largest moon of Saturn, it has rivers and lakes of liquid farts carved through its surface
  7. 10. 1 Down can't perform this bodily function