Chapters 10 & 11 (The Death of Stars & Neutron Stars & Black Holes) Quiz

Astronomy 101: Chapter 10: The Death of Stars &
Chapter 11: Neutron Stars and Black Holes
1. How does the main-sequence lifetime of a star compare to its entire fusion lifetime?
a. Stars spend about 10% of their fusion lifetimes on the main sequence.
b. Stars spend about 30% of their fusion lifetimes on the main sequence.
c. Stars spend about 50% of their fusion lifetimes on the main sequence.
d. Stars spend about 70% of their fusion lifetimes on the main sequence.
e. Stars spend about 90% of their fusion lifetimes on the main sequence.
2. What event marks the end of every star's main-sequence life? 3. Why do medium- and high-mass main-sequence stars expand to become giants and
supergiants?
4. Why can the lowest-mass stars never become giants?