Across
- 3. study of things found outside of the earth
- 4. the sun is at the center of this model
- 8. movement of a body around its axis
- 10. a group of stars with a recognizable pattern
- 11. force that holds moons,planets and comets in orbit
- 14. first day of spring or autumn
- 15. a gas and dust cloud in space
- 17. idea that the universe suddenly came into existence 14 billion years ago
- 19. a region in the sky, which contains stars
Down
- 1. large pieces of rock that orbit the sun
- 2. Ceres, Pella and Vesta are found here
- 5. earth is at the center of this model
- 6. everything pulls on everything else, it's the law!
- 7. first day of summer or winter
- 9. movement of one heavenly body around another
- 12. a very bright star explosion
- 13. distance that light travels in one year
- 16. our galaxy
- 18. temporary flare-up in brightness of a star
