Why are the majority of stars in the sky in the main-sequence phase of their lives?
A) This is the longest-lasting phase in each star's life.
B) Most stars die at the end of the main-sequence phase.
C) This is the only phase that is common to all stars.
D) Most stars in the sky were created at about the same time,so they are all in the same phase of their lives.

Question

Quizplus · Accepted Answer

The main-sequence phase is the longest-lasting phase in each star's life, typically lasting billions of years. Therefore, it is expected that the majority of stars seen in the sky would be in this phase.

Why Are the Majority of Stars in the Sky in the Main-Sequence