Nebulae

1. What is a nebula?

2. What kind of nebula emits light?

3. Why do they emit light?

4. Why do they appear red in colour?

5. Why do reflection nebulae appear blue?

6. What is another name for dark nebulae?

7. Why are they dark?

8. How do planetary nebulae form?

9. Why are they badly named?

10. Find your own picture of each type of nebula (other than the ones on this website).