If I'm right its spiral, common sense, since spiral galaxies arm the only kinds of galaxies with "arms".
Spiral galaxies
A giant elliptical galaxy at the center of a dense cluster
A giant elliptical galaxy at the center of a dense cluster
That is called a globular cluster.
A point where the center does not have gravitational pull... once things stop orbiting thats it for the galaxy
It is called simply a "globular cluster". Another possibility: The closely allied stars at the center of a galaxy tend to be older, redder stars than those in the outlying arms of the galaxy.
All of the earth's motion is completely determined by gravity: the gravitational pull on the earth by the sun (and the larger outer planets), the gravitational pull of the Milky Way galaxy on the sun, the gravitational pull of our local cluster on the Milky Way galaxy and so on, up the ladder.
Yes, a clump cluster galaxy is a type of peculiar galaxy.
Yes, the sun is orbiting the center of the galaxy. what? that's a load of rubbish, it IS the center of the galaxy. the MILKY WAY galaxy, that's why there IS a galaxy, because its gravitational pull pulled planets into orbit, thus CREATING one!
The largest black hole has the strongest gravitational field. We do not know where that would be, but it is most likely in the center of a galaxy somewhere in the universe.
A group of galaxies is called a galaxy cluster or galaxy group.
Andromeda Galaxy - M31 Our Galaxy cluster is called "The local group".