Active star formation does not occur in elliptical galaxies because they
A) rotate too fast.
B) contain little molecular hydrogen.
C) are too massive.
D) are too far away.
Correct Answer:
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Q19: Approximately _ of spiral galaxies are barred.
A)
Q20: We know AGN are about the size
Q21: Spiral structure
A) rotates at the same speed
Q22: Roughly what percentage of the total mass
Q23: Which of the following is NOT a
Q25: Why is 21-cm radiation a good spiral
Q26: Which of the following are NOT predominantly
Q27: Elliptical galaxies appear red because
A) they are
Q28: What makes up the majority of the
Q29: Long-lasting spiral density waves occur in the
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