Across
- 7. Gas and dust between stars.
- 9. Largest Molecular Clouds.
- 10. Produced by gas and dust illuminated by a star.
- 11. Cloud of gas in space.
- 12. Makes distant stars appear too red because of dust particles.
- 13. Much Narrower than spectral lines.
- 15. 1% of the interstellar medium.
- 17. Hotter but lower density gas.
- 18. When the electrons fall lower level and emit photons.
- 19. Coronal gas produced by a supernova explosion.
- 20. Cloud of gas that is noticeable because it blocks light from distant stars.
Down
- 1. A certain wave that blows clouds apart
- 2. a region in the nebula.
- 3. This is where electrons get caught when atoms collide in the nebulae.
- 4. Dense clouds of gas and dust.
- 5. Dimming makes stars look fainter than they should.
- 6. Neutral Hydrogen Clouds.
- 8. Exerting force.
- 14. Is when ultraviolet radiation from hot stars ionizes nearby gas.
- 16. Very hot gas released by a star.