Which of the following is NOT a difference between spiral and elliptical galaxies?
A) Spiral galaxies still have ongoing star formation whereas elliptical galaxies do not.
B) Spiral galaxies have dark matter halos whereas elliptical galaxies do not.
C) Spiral galaxy disks contain lots of cold gas and dust whereas elliptical galaxies do not.
D) Spiral galaxies tend to be bluish whereas elliptical galaxies tend to be reddish.
Correct Answer:
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Q18: Today only 30 percent of galaxies are
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
Q24: Active star formation does not occur in
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
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