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.
E) They have few heavy elements.

Question

Quizplus · Accepted Answer

Broad emission lines indicate rapid internal motions due to the high velocities of gas in the quasar's broad-line region.

What Do the Broad Emission Lines in Quasar Spectra Tell