Astronomy 101: Chapter 10: The Death of Stars &Chapter 11: Neutron Stars and Black Holes1.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?
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3.Why do medium- and high-mass main-sequence stars expand to become giants andsupergiants?
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4.Why can the lowest-mass stars never become giants?
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