Over which of the following stages of stellar evolution does the radius of a star remain approximately constant?
A) Birth and initial formation
B) Red-giant phase
C) Asymptotic giant branch phase
D) Main-sequence phase

Question

Quizplus · Accepted Answer

During the main-sequence phase, the force of gravity pulling inward on the star is balanced by the outward pressure from nuclear fusion reactions in the core. This balance leads to a stable size, and the radius remains approximately constant during this phase.

Over Which of the Following Stages of Stellar Evolution Does