If a main sequence, giant, and a supergiant all have the same spectral class, what characteristic is known to make these stars different?
A) luminosity
B) distance
C) surface temperature
D) color
E) It shows that the more massive stars are cooler.

Question

Quizplus · Accepted Answer

The main difference between stars of the same spectral class but different types (main sequence, giant, supergiant) is their luminosity. While they have similar surface temperatures and colors, their sizes and brightness vary significantly.

If a Main Sequence, Giant, and a Supergiant All Have