If quasars are at the distances most astronomers believe they are, then (for the most luminous ones) their luminosities must be:
A) like the Sun
B) like the combined luminosity of a cluster of a hundred stars
C) much fainter than the Sun
D) like the accretion disk of a black hole formed from a single star (like Cygnus X-1)
E) like the combined luminosity of a hundred trillion (1014) Suns
Correct Answer:
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