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Imbajade Imbajade
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5 years ago
Why do elliptical galaxies appear yellow or red?
A) They have very little dust or cool gas, and thus have little ongoing star formation
B) They contain only massive-stars that have progressed to the red-giant stage
C) They contain no hot, young blue stars
D) A and B
E) A and C
Textbook 
The Essential Cosmic Perspective

The Essential Cosmic Perspective


Edition: 7th
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