Author Question: Most active galactic nuclei are at large distances from us; relatively few nearby galaxies harbor ... (Read 20 times)

ghost! · **on:** Jul 27, 2018

Most active galactic nuclei are at large distances from us; relatively few nearby galaxies harbor active galactic nuclei. What does this imply?

A) Massive black holes existed only when the universe was young and no longer exist today.
B) Active galactic nuclei tend to become less active as they age.
C) The jets seen in many active galactic nuclei must cause them to move far away from us.
D) Active galactic nuclei can form only at large distances from the Milky Way.

Question 2

The amount of diffraction and thus the resolution of the telescope depends upon

A) the brightness of the object.
B) the size and sensitivity of the CCD chip used for imaging.
C) the design of the telescope.
D) whether the telescope is a reflector or refractor.
E) the wavelength used and the size of the main telescope objective lens or mirror.