The Emission Lines in Quasar Spectra Were Difficult to Identify

question 45

Multiple Choice

The emission lines in quasar spectra were difficult to identify initially because

• A) no one expected violet and ultraviolet spectral lines to be shifted so far toward the red.
• B) the observed emission lines were so broad because of internal motions in the quasar that they were difficult to identify.
• C) they appeared to be created by elements that did not exist on Earth.
• D) they were very faint and could not be measured accurately.

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