Today, the number density of quasars in the universe is quite small. For how long in the past has this been true?
A) 7 billion years
B) 9 billion years
C) 11 billion years
D) 13 billion years
Correct Answer:
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Q21: The distance to the bright quasar 3C
Q22: Quasars are
A) sources of great energy, very
Q23: The highest recession velocities that have recently
Q24: Quasars appear to be
A) very distant and
Q25: Which of these statements MOST accurately characterizes
Q27: The redshift of the quasar Cygnus A
Q28: The extreme redshifts of quasar spectra are
Q29: All quasars appear to be
A) moving toward
Q30: Quasars emit significant amounts of radiation from
Q31: Which observation of quasars convinced astronomers that
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