For low-mass stars, the life cycle phase that just precedes white dwarf formation is
A) planetary nebula.
B) variable star.
C) main-sequence star.
D) red giant.

Question

Quizplus · Accepted Answer

The phase that immediately precedes the formation of a white dwarf in the life cycle of a low-mass star is the planetary nebula phase. During this phase, the outer layers of the star are expelled, leaving behind the hot core which eventually cools to form a white dwarf.

For Low-Mass Stars, the Life Cycle Phase That Just Precedes