mine

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Across
  1. 3. - Dwarf planet
  2. 6. - Moon mission program
  3. 8. - Space telescope
  4. 9. - Dwarf planet in the asteroid belt
  5. 10. - Russian space traveler
  6. 14. - Space traveler
  7. 16. Bang - Origin of the universe
  8. 18. - Spacecraft type
  9. 20. - Red planet
  10. 21. - Interstellar cloud
  11. 23. - Eighth planet
  12. 26. - Stellar explosion
  13. 28. - Celestial ice ball
  14. 29. - Studier of the stars
Down
  1. 1. - Planet orbiting another star
  2. 2. - Spiral galaxy
  3. 4. - Jupiter mission
  4. 5. - Astronomical instruments
  5. 7. - Evening "star"
  6. 11. - Ringed planet
  7. 12. - Prominent constellation
  8. 13. - Relating to the moon
  9. 15. - Seventh planet
  10. 17. - Zodiac sign and space mission
  11. 18. - Moon of Jupiter
  12. 19. - Collection of stars
  13. 22. - Shooting star
  14. 24. Hole - Gravitational singularity
  15. 25. - Stellar explosion
  16. 27. - Spacecraft launcher