Astronomers identify the main sequence on the H-R diagram with what activity in the course of a star's life?
A) forming from a reservoir of cosmic material
B) fusing hydrogen into helium in their cores
C) letting go of a huge outer layer
D) dying
E) you can't fool me; so many stars are on the main sequence that there is no special stage in a star's life that can be identified with it

Question

Quizplus · Accepted Answer

The main sequence on the H-R diagram is a diagonal line that shows stars fusing hydrogen into helium in their cores. This is the stage where the majority of stars spend most of their lives.

Astronomers Identify the Main Sequence on the H-R Diagram with What