Paul Hollister wrote:
Is the whole of the galaxy a centrifuge or a centripetal drain? If the
supermassive black hole in the nuclear center of each galaxy has been
formed by "gobbling up" millions and billions of stars as current
theories suggest, then the galaxy is a centripetal drain, wherein the
black hole is swallowing the mass of the galaxy star by star. However,
the spiral arm structure of spiral galaxies appear as if they were
formed by centrifugal force! What do you think?


I think there is no such thing as centrifugal force.
I think that posing a question that asks whether the behavior seen is
due to centripetal or centrifugal force, is a question born of
confusion.

PD