The unified model of active galactic nuclei focuses on differences caused by the age of the central black hole.
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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
Q8: Quasars are radio sources that look like
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
Q14: Seyfert galaxies are_
A) spiral galaxies with unusually
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