Elliptical galaxies contain hot gas that is heated by supernova explosions.
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Q11: Any asymmetry in the gravity field of
Q12: Seyfert galaxies are unique because they have
Q13: Star formation in spiral galaxies is enhanced
Q14: The Hubble diagram is a way of
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Q17: We can determine the three-dimensional shape of
Q18: A galaxy can contain a supermassive black
Q19: Although elliptical and irregular galaxies have been
Q20: We know AGN are about the size
Q21: Which of the following are NOT found
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