Which of the following is true of Seyfert galaxies?
A) They have no spiral arms
B) They have unusually bright nuclei
C) They are a form of elliptical galaxy
D) They are all found in the Local Group of galaxies
Correct Answer:
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Q4: About how large is a 1 million
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
Q10: Quasars all have great distances.Why are there
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
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