Across
- 2. appears as a dark ribbon
- 5. astronomical applications
- 7. radiation consisting of
- 8. two corresponding points
- 12. 300,000km per sec
- 14. Made up of stars
- 16. gives energy
- 17. a spiral galaxy but not the milkyway
- 19. space contains
- 20. bright center
- 22. Huge galaxy such as the Milky-Way
Down
- 1. light can't excape
- 3. A plot
- 4. between radio waves
- 6. compare sizes
- 9. large cloud
- 10. doesn't fit into any category
- 11. colors
- 13. A hot star
- 15. death that causes a explosion
- 18. group of stars that rotate
- 21. proportions