Which of the following is not true of quasars?
A) Some quasars are more than a thousand times more luminous than the Milky Way.
B) Quasars were more common in the past.
C) The light produced by quasars comes from an accretion disk surrounding a supermassive black hole.
D) Quasars are powered by the intense production of large numbers of stars that can only be sustained for a relatively short time.
E) Some quasars can change their brightness on the timescale of hours.
Correct Answer:
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