What is at the center of the galaxy?
The center of the (Milky Way) galaxy is a black hole. Think
about a heterogeneous mixture of materials of different densities
placed under the influence of gravity. Heavier materials tends to
stay inner. Expect the same here. The heavier black hole is ought
to stay at the center of the galaxy. Answer Scientist think
that its a super black hole (I forgot what its really called),
think of it as a egg, the yolk is the center and the white is the
actual galaxy part. If you didn't know, the Andromeda galaxy has
two 'yolks': there appear to be two main concentrations of mass
near the center; some astronomers think this may be a sign that the
Andromeda galaxy is the result of the collision of two smaller
galaxies. A massive black hole is believed to be in the center of
the Milky Way, and is now believed to be at the center of most, if
not all, galaxies.
Current cosmology holds that a supermassive black hole
typically resides at the center of a galaxy.