Stars on the main sequence have different luminosities because
A) they have different chemical compositions.
B) they have different ages.
C) they are at different distances from the Sun.
D) they have different masses.
E) they have different apparent magnitudes.

Question

Quizplus · Accepted Answer

Stars on the main sequence have different luminosities primarily because they have different masses. The mass of a star determines its core pressure and temperature, which in turn affects the rate of nuclear fusion and thus its luminosity.

Stars on the Main Sequence Have Different Luminosities Because