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