sput

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Across
  1. 1. - Second planet from the sun
  2. 5. - Space traveler
  3. 8. - Celestial object with a tail
  4. 13. - Extraterrestrial lifeforms
  5. 15. - Relating to the moon
  6. 16. - Largest planet in our solar system
  7. 17. - Luminous celestial body
  8. 18. - Path of a celestial object around another
  9. 19. - Large system of stars and interstellar matter
  10. 20. - Interstellar cloud of gas and dust
Down
  1. 2. - Pertaining to the sun
  2. 3. - Sixth planet from the sun
  3. 4. - Russian space traveler
  4. 6. - Spacecraft propulsion device
  5. 7. - Optical instrument for observing distant objects
  6. 9. - Shooting star
  7. 10. - The Red Planet
  8. 11. - Dwarf planet in our solar system
  9. 12. - NASA's lunar mission program
  10. 14. - Famous space telescope