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