The _____ of active galactic nuclei (AGN) is an attempt to explain the different types of AGN using a single model viewed from different directions.
A) hierarchical model
B) hybrid hierarchical model
C) monolithic model
D) unified model
Question 2
The _____ of quasars imply that they must be at great distances, some farther away than any known galaxy.
A) large redshifts
B) small redshifts
C) large blueshifts
D) small blueshifts