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