The present estimate of the age of the universe is about 14 billion years.How long will a half-solar-mass star spend on the main sequence,compared with the present age of the universe? (See Table 11-2,Comins,Discovering the Essential Universe,6th ed.)
A) about three times the age of the universe
B) more than ten times the age of the universe
C) less than 1/10 of the age of the universe
D) about 1/2 of the age of the universe
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