I know that there are many different subscriptions on how the universe will end, and I have a question. If the universe is expanding and is increasing in expansion than theroreticly it may fall in on it's self... That much I understand. (I am only refering to this theroy, because it confuses me. So after the universe snaps back on it's self would it create a supermassive black hole, or would there be so much mass involved that the singularity that it formed not beable to contain it's self and just rip back out creating the universe over and over again throughout time. Is this even a theroy or have I missunderstood what I have read?