What observational fact convinces astronomers that the source of energy in a typical quasar is physically very small?
A) rapid variation in the energy output of the source
B) extreme distance of all quasars
C) starlike appearance of quasars in Earth's sky
D) narrowness of the emission lines in the spectra of quasars
Correct Answer:
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Q49: Which observations of the radiation from quasars
Q50: What observations convince astronomers that the energy
Q51: Compared with the total output of energy
Q52: The surprising observational fact about quasars is
Q53: Suppose the X-ray signal from a quasar
Q55: Variations in the luminosity of quasars over
Q56: What is the relationship between the size
Q57: Which of these would NOT necessarily be
Q58: How can astronomers determine the size of
Q59: The fact that quasars can be detected
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