What can be said with certainty about a red star and a blue star?
A) The red star is more massive than the blue star.
B) The blue star is hotter than the red star.
C) The red star has a greater radial velocity than the blue star.
D) The red star is closer to Earth than the blue star.
E) The blue star has a greater proper motion than the red star.

Question

Quizplus · Accepted Answer

The color of a star is directly related to its surface temperature, with blue stars being hotter than red stars. This is a fundamental principle of stellar astrophysics, where stars emit colors according to their surface temperatures due to black body radiation principles.

What Can Be Said with Certainty About a Red Star