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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?
a.
The triple-alpha process begins in their cores.
b.
Their hydrogen core fusion rate increases.
c.
Iron cores form and fusion ends.
d.
Gravity gets weaker with time.
e.
Hydrogen shell fusion begins.
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- Fall '11
- susanbontems
- Supernova, White dwarf, GIANTS, white dwarfs
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