Across
- 3. a moon of Jupiter
- 4. "ringed planet"
- 7. first artificial satellite ever launched
- 8. meteoroid which falls to the ground
- 10. a constellation meaning "Great Bear"
- 14. leading theory about the origin of the universe
- 16. group of stars which forms imaginary patterns
- 17. size of the Sun
- 18. moon of Mars
- 19. famous comet appearing every 76 years
- 20. natural satellite of the moon
- 21. rocky body too small to be called planet
- 22. a type of galaxy
- 24. first man on space
- 25. brightest star in the Earth's sky
Down
- 1. named after the Roman god of love and beauty
- 2. universe
- 5. someone who studies astronomy
- 6. highest mountain in the Solar System
- 9. movement of a planet on its axis
- 11. nearest galaxy to the Milky Way
- 12. all the matter and energy and contents of space
- 13. heliocentric
- 15. collection of gas,dust and billions of stars
- 23. first person to focus the telescope to the heavens