How is the length of a star's lifetime related to the mass of the star?
A) Lower-mass stars run through their lives faster and have shorter lifetimes.
B) The lifetimes of stars are too long to measure, so it is not known how (or if) their lifetimes depend on mass.
C) A star's lifetime does not depend on its mass.
D) Higher-mass stars run through their lives faster and have shorter lifetimes.
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