White dwarfs are not included in the luminosity classification because they are:
A) not yet active stars; they have not yet begun nuclear reactions.
B) no longer producing energy by nuclear reactions.
C) no longer radiating energy away.
D) too small.

Question

Quizplus · Accepted Answer

White dwarfs are no longer producing energy by nuclear reactions, making them not suitable for luminosity classification based on their energy output.

White Dwarfs Are Not Included in the Luminosity Classification Because