We know AGN are about the size of our Solar System because of how fast they change in brightness over time.
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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
Q18: A galaxy can contain a supermassive black
Q19: Although elliptical and irregular galaxies have been
Q21: Which of the following are NOT found
Q22: The image below was probably taken in
Q23: The disks of spiral galaxies appear blue
Q24: Stars in elliptical galaxies have velocities that:
A)
Q25: The three-dimensional shape of _ is set
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