Quasars all have great distances.Why are there no nearby quasars?
A) No quasars have existed in the recent past
B) Quasars avoid spiral galaxies
C) Quasars are found only in clusters of galaxies
D) If quasars are too close to us,they look like pulsars
Correct Answer:
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Q5: Some quasars vary in brightness in only
Q6: Why do Seyfert Galaxies strengthen the case
Q7: Quasars are currently believed to be
A)The brightest
Q8: Quasars were originally discovered as
A)Strong radio sources
Q9: Which of the following is true of
Q11: How do we know that the quasars
Q12: For a typical luminous radio galaxy,most of
Q13: Why was it difficult for astronomers to
Q14: How do astronomers explain the "superluminal" motions
Q15: It is thought that most large galaxies
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