Matter flowing into a black hole cools until it is accelerated into a jet.
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Q4: The luminosity of a Seyfert galaxy varies
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
Q14: Seyfert galaxies are_
A) spiral galaxies with unusually
Q16: Double-lobed radio galaxies are an effect of
Q17: Most supermassive black holes are dormant.
Q18: Collisions in the early Universe were rare.
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