Why was it difficult for astronomers to identify the spectral lines observed in the spectra of quasars?
A) They were formed by elements unknown on Earth
B) There were too many lines in the spectra
C) The lines were greatly redshifted
D) No two quasars have the same spectral lines
Correct Answer:
Verified
Q8: Quasars were originally discovered as
A)Strong radio sources
Q9: Which of the following is true of
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
Q14: How do astronomers explain the "superluminal" motions
Q15: It is thought that most large galaxies
Q16: The spectra of quasars reveal lines of
Q17: The radio emission from radio galaxies and
Q18: According to current theories,the energy source of
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