The Local Group, the cluster of galaxies to which our Milky Way galaxy belongs, is a a. rich, irreg?

Question

The Local Group, the cluster of galaxies to which our Milky Way galaxy belongs, is a

a. rich, irregular cluster of many thousands of galaxies.

b. poor, irregular cluster of two to three dozen galaxies.

c. rich, roughly spherical cluster of many thousands of galaxies.

Answer 1

B is the least wrong.

The Local Group is not a galaxy cluster - it's a group.

If you could dwarf galaxies (and i would), then we probably have more than 2 or 3 dozen.

a. is more wrong because there aren't thousands of galaxies.

c. is more wrong because the local group isn't spherical.  It's mostly flat.

So b. is mostly correct.

Answer 2

In the pecking order:

Group

Cluster

Super-cluster

Wall

A group is the smallest assemblage of galaxies.  You need at least 100 galaxies before being called a cluster.

Answer 3

B is correct