A galaxy can contain a supermassive black hole that remains invisible because no matter is falling onto the black hole.
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Q13: Star formation in spiral galaxies is enhanced
Q14: The Hubble diagram is a way of
Q15: The type of AGN we see depends
Q16: Elliptical galaxies contain hot gas that is
Q17: We can determine the three-dimensional shape of
Q19: Although elliptical and irregular galaxies have been
Q20: We know AGN are about the size
Q21: Which of the following are NOT found
Q22: The image below was probably taken in
Q23: The disks of spiral galaxies appear blue
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