Quasars are radio sources that look like stars in visible-light photographs.
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Q3: Supermassive black holes are very large, the
Q4: The luminosity of a Seyfert galaxy varies
Q5: Active galactic nuclei were first found through
Q6: Normal galaxies in the present never went
Q7: Seyfert galaxies appear similar to normal spirals
Q9: The unified model of active galactic nuclei
Q10: The size of a galaxy's central black
Q11: Black holes erupt when matter flows into
Q12: Quasars are isolated supermassive black holes, and
Q13: Matter flowing into a black hole cools
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