Megan DeCianni's Quiz

 in a cold, dense molecular cloud. As the cloud fragment collapses
under gravity, it becomes a protostar.

2. greater than about 300M Sun

3. H fusion in core (main sequence)
H fusion in shell around contracting core (red giant)
He fusion in core (horizontal branch)
Double shell-fusion (red giant)

4. ejection of H and He in a planetary nebula

5. yes

6. yes

7. emission nebula consisting of an expanding glowing shell of ionized
gas ejected during the asymptotic giant branch phase of certain types
of stars late in their lives

8. yes

9. stars very in size. 300M Sun- 0.08 M Sun

10. ensures that protostars rotate rapidly