-The Sun has an expected main-sequence lifetime of about 10 billion years. About how long would a 2-solar-mass star stay on the main sequence?
A) 10 million years
B) 1 billion years
C) 10 billion years
D) 20 billion years

Question

-The Sun has an expected main-sequence lifetime of about 10 billion years. About how long would a 2-solar-mass star stay on the main sequence?
A) 10 million years 
B) 1 billion years 
C) 10 billion years 
D) 20 billion years

Quizplus · Accepted Answer

The main-sequence lifetime of a star decreases with increasing mass. A 2-solar-mass star burns its fuel much faster than the Sun and would have a significantly shorter main-sequence lifetime, roughly 1 billion years.

-The Sun Has an Expected Main-Sequence Lifetime of About 10