The Surprising Observational Fact About Quasars Is That They Appear

The surprising observational fact about quasars is that they appear to:

A) produce the energy output of greater than 100 galaxies in a volume similar to that of our planetary system.
B) be the largest known structures in the universe, although they produce only modest amounts of energy.
C) be associated with ancient supernova explosions.
D) be moving rapidly toward us while emitting large amounts of energy.

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