Elliptical galaxies appear red because they
A) are moving away from us.
B) contain mostly ionized hydrogen gas.
C) contain mostly old stars.
D) contain lots of dust.
E) contain a mix of old and young stars.

Question

Quizplus · Accepted Answer

Elliptical galaxies appear red because they contain mostly old stars, which are cooler and emit more red light compared to younger, hotter stars that emit more blue light.

Elliptical Galaxies Appear Red Because They