A helium flash occurs in the cores of all stars
A) that contain helium.
B) of more than 2 solar masses.
C) of fewer than 2 solar masses.
D) that have become red giants.

Question

Quizplus · Accepted Answer

A helium flash occurs in the cores of low-mass stars (less than 2 solar masses) as they evolve off the main sequence and become red giants. This is because these stars do not have enough mass for helium fusion to occur steadily in the core, causing the buildup of helium until a sudden ignition occurs, known as a helium flash. Higher-mass stars do not undergo a helium flash because they have enough mass and pressure to support steady nuclear fusion in their cores.

A Helium Flash Occurs in the Cores of All Stars