Why Was It Difficult for Astronomers to Identify the Spectral

question 7

Multiple Choice

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

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