Uranus, Neptune, Pluto

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Across
  1. 7. Roman god of the underworld in Roman mythology
  2. 8. the astronomer who discovered Pluto
  3. 9. a large storm on Neptune similar to Jupiter’s red spot
  4. 11. the astronomer who discovered Uranus
  5. 12. a scientist who studied outer planets and the region beyond Neptune
  6. 13. the largest moon of Neptune that orbits in a retrograde direction
  7. 15. a moon of Uranus known for its unusual and varied surface
  8. 16. Roman god of the sky in Roman mythology
  9. 18. a dwarf planet located in the outer solar system
  10. 20. a region beyond Neptune filled with icy objects and dwarf planets
  11. 21. smaller moons that orbit Pluto
Down
  1. 1. space probe a spacecraft that flew by Pluto and studied it up close
  2. 2. a spacecraft that flew by Uranus and Neptune and sent back important data
  3. 3. when a planet passes in front of a star and blocks its light
  4. 4. the largest moon of Pluto
  5. 5. the scientist who suggested naming the planet Uranus
  6. 6. an astronomer who searched for a ninth planet
  7. 10. number of moons equals five
  8. 14. the astronomer who first observed Neptune
  9. 17. a cloud that fast moving bright cloud in Neptune’s atmosphere
  10. 19. Roman god of the sea in Roman mythology