Eighty percent of the stars on the H-R Diagram are on the main sequence, and that is because the star is in hydrostatic equilibrium due to the _____.
A) degenerate property of hydrogen
B) degenerate property of helium
C) Hertzsprung-Russell Principle
D) fusion of hydrogen
E) fusion of helium

Question

Quizplus · Accepted Answer

The main sequence stars are in hydrostatic equilibrium primarily due to the fusion of hydrogen into helium in their cores, which provides the outward pressure needed to balance the inward pull of gravity.

Eighty Percent of the Stars on the H-R Diagram Are