What is a red giant?
A) A large,red star burning hydrogen into helium in its core
B) A protostar in the "upper right" part of the Hertzsprung-Russell diagram
C) A large emission nebula
D) A star burning hydrogen into helium in a shell around the core

Question

Quizplus · Accepted Answer

A red giant is a star burning hydrogen into helium in a shell around the core, causing it to expand and cool, resulting in a red appearance. Option A refers to a main sequence star, while option B refers to a star in the early stages of formation. Option C refers to a type of nebula, which is not a star.

What Is a Red Giant