angel's space crossword

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Across
  1. 2. first element in the universe
  2. 5. third zone of our solar system
  3. 6. rover that landed on mars in 2021
  4. 8. planet that transited the sun last in 2012
  5. 12. nebula with the coldest naturally occurring temperature in the universe (1 K)
  6. 13. largest moon in the solar system
  7. 14. planet with the highest gravity in our solar system
  8. 16. pluto's smallest moon
  9. 17. smallest moon of mars
  10. 19. tenth planet demoted by the IAU
  11. 20. lunar phase shifting toward the new moon
  12. 21. considered the other blue planet
  13. 22. first game played on the moon
Down
  1. 1. meteor that touches the earth surface
  2. 3. first galaxy to be discovered besides The Milky Way
  3. 4. one of saturn’s two moons that shepherd the f ring
  4. 7. first canadian's satellite
  5. 9. name of apollo 11's lunar module
  6. 10. first mission to land a probe on a comet
  7. 11. first planet discovered by a telescope
  8. 15. displacement of spectral lines toward longer wavelenghts
  9. 18. when a star collapses on itself