The energy-generation mechanism for active galaxies is believed to be
A) large numbers of supernovae erupting simultaneously.
B) cosmic radioactive decay.
C) black holes colliding.
D) accretion disks around supermassive black holes.
Correct Answer:
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Q88: Evidence obtained over the last few years
Q89: What recent evidence seems to indicate that
Q90: The mechanism that appears to generate two
Q91: The radio emission from the jets in
Q92: See Figure 18-10 in the text. NGC
Q94: Which of these statements has NOT provided
Q95: The jets of material moving away from
Q96: Astronomers believe a supermassive black hole of
Q97: What is now considered to be the
Q98: What do astronomers expect to be the
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