This is good...

The point being,. We have no knowledge of what might be beyond the universe. We in fact doubt that there can be a outside.
This will stand as fact until we find another....
We can make the assumption that all galaxies and clusters of are involved in the ever moving gravitational dance... Gravitational forces and motion are curved and the apparent rotation of all the components of the universe is a conclusion of the motion we understand. It does not sagest the whole universe is rotating or even orbiting some mythical central mass. That would not seem to be the case. A very interesting set of questions.