Author Question: A cluster containing a thousand or more galaxies, usually mostly ellipticals, scattered over a ... (Read 19 times)

madam-professor · **on:** Jul 27, 2018

A cluster containing a thousand or more galaxies, usually mostly ellipticals, scattered over a volume only a few Mpc in diameter is referred to as a(n) _____.

A) elliptical galaxy cluster
B) irregular galaxy cluster
C) poor galaxy cluster
D) rich galaxy cluster

Question 2

The Andromeda Galaxy has a look-back time of:

A) 4 years.
B) 2000 years.
C) 2 million years.
D) 2 billion years.