Seyfert galaxies appear similar to normal spirals with extremely luminous cores.
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Q2: Supermassive black holes have weaker gravity than
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
Q8: Quasars are radio sources that look like
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
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