Stars lying above the main sequence that are relatively cool but very bright are called
A) red giants.
B) white dwarfs.
C) brown dwarfs.
D) pulsars.

Question

Quizplus · Accepted Answer

Red giants are stars that have exhausted the hydrogen in their cores and have expanded and cooled, placing them above the main sequence on the Hertzsprung-Russell diagram. They are relatively cool but very luminous due to their large size.

Stars Lying Above the Main Sequence That Are Relatively Cool