What is the lifetime on the main sequence of a 2-solar-mass star compared to the approximately 10-billion-year life of our Sun Pick the best answer.
A)$1.8 × 10^{11} $years
B)$1.8 × 10^{10}$ years
C)$1.8 × 10^8$ years
D)$1.8 × 10^6$ years
E)$1.8 × 10^3$ years

Question

Quizplus · Accepted Answer

The lifetime on the main sequence of a 2-solar-mass star is much shorter than that of our Sun, because more massive stars burn their fuel faster. While the Sun will live for approximately 10 billion years, a star with twice the mass will exhaust its fuel in only around 20 million years. Therefore, the best choice from the given options is C, which states a lifetime of 1.8 × 10^8 years - this is in the correct range for a 2-solar-mass star's lifetime on the main sequence.

What Is the Lifetime on the Main Sequence of a 2-Solar-Mass