posted by C .
magine you look through a really strong telescope and see a rich cluster. Your telescope is so good that you can see a single galaxy at the center of the cluster. What can you say about that galaxy and be pretty confident that you are correct?
It has mass smaller than that of the Milky Way.
The galaxy is likely not in dynamic equilibrium.
It is a giant elliptical galaxy.
It is a spiral galaxy.
Well, I know, but I'm not telling you. Learn it! It's all in the Cosmology Modules.