What do the broad emission lines in quasar spectra tell astronomers about these objects?
A) They are very far away.
B) They are moving away from us.
C) They have rapid internal motions.
D) They are very dense.

Question

Quizplus · Accepted Answer

The broad emission lines in quasar spectra show that these objects have rapid internal motions. This suggests that they contain massive amounts of gas that is moving quickly, likely due to the strong gravitational pull of a supermassive black hole at their center.

What Do the Broad Emission Lines in Quasar Spectra Tell