Astronomy

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Across
  1. 2. Moon that orbits Neptune "backwards"
  2. 4. dwarf planet beyond the orbit of Neptune
  3. 8. moon of Jupiter with lots of volcanoes
  4. 10. when a planet spins on its axis
  5. 11. phase of the Moon that is mostly but not quite full
  6. 13. coldest planet
  7. 15. dwarf planet in the asteroid belt
  8. 16. rises about 50 minutes later every night
  9. 17. moon of Saturn that is larger than Mercury
  10. 18. simplest and most common element in the universe
  11. 19. how long it takes Earth to travel around the Sun
  12. 20. Phobos and Deimos orbit this planet
  13. 21. largest inner planet
Down
  1. 1. hottest planet
  2. 3. when a planet goes around the Sun
  3. 5. star in the sky that appears to move the least
  4. 6. type of eclipse when the Moon blocks the Sun during the day
  5. 7. larger than all the other planets combined
  6. 9. the season in Australia in July
  7. 11. The Milky Way is one of these.
  8. 12. largest object in the solar system
  9. 14. everything there is