Across
- 1. Gaseous, large, far from Sun
- 6. Of space
- 7. Spectra from gas
- 9. Nova Collapse of Massive star
- 10. Proof the universe expands
- 14. Spectra with all wavelengths
- 17. Ability to sustain life
- 19. Gas and dust collecting
- 20. Amount of time
- 21. Spectra blocked by gas
Down
- 2. Heavier elements are made
- 3. How far from a circle
- 4. Rocky, small, close to Sun
- 5. H stands for...
- 8. Unit of temperature
- 11. Two nuclei become one
- 12. Brightness
- 13. Has strength and direction
- 15. Size of measure
- 16. Points inside an orbit
- 17. He stands for...
- 18. Measure of distance