There are no perfect black bodies on the universe. But there are a lot of them which can be approximated (with good precision) by the black body description.
No. The black body is an "ideal thing" or a construct, and there isn't anything that "perfect" in nature.
star cycle
As long as the Universe exists. See related question for more information.
Yes, larger bodies of dark matter that are considered responsible for pulling apart the universe.
no dude, the evidences of the existence of black holes is now widely accepted and i believe that black holes rules our universe but it is difficult to find them because black holes are nearly the perfectly black bodies
The lowest pitch discovered is a concert Bb, 57 octaves below middle C. It is emitted by a supermassive black hole.
Your question is somewhat vaguely worded. Possibly you are thinking of the force of gravity, possibly you are thinking of a black hole.
There are already black holes within the universe
The universe likely contains millions upon millions of black holes.
Black Dwarfs are still theoretical bodies in the Universe. Belief and scientific observations are two different things. In theory, they will exist, but until one is observed, there existence can not be confirmed. See related question
Answer
Even though black holes suck through parts of the universe, the universe is inevitably big, and growing so as the universe is being sucked into another dimension by black holes, it is also expanding.