The known world will end 7 years after Jesus' second comng. His first coming will be the Rapture. 3 1/2 years after the second coming is when all nonbelievers will learn the true identity of the anti christ, who they will all actually be forced to worship as GOD. The second 3 1/2 years is when the world shall know "God's WRATH" (for credibility of the word wrath, know that it has never been used to describe an event ordained by God in written history - i.e. the flood, jericho, sodom and gemorrah, etc). 7 years after the second coming is when the world will end, and the 1000 year reign of Christ and his church shall take place in the "new world". OH, and He is coming soon. The prophecies are all playing out, and pointing straight at His return.
As for 2012, the alignment of the planets and the sun and the moons therin and therof, are what past predictions are based on. I would definitely be led to believe that some CRAZY stuff will go down, based just on the MAJOR gravitational pull of that one instance in time when all planets and such are pulling the same balanced direction in stead of their usual counterbalanced pull. Im very curious as to what the oceans are going to do. Weather too. Speculations are controvercial at best. I cant wait. I wont be surprised if NOTHING at all happens. It's just one of the RARE moments we are luck enough to experience inh ourlifetime, as it wont happen again for 4000 years.
We dont have to worry of any black hole in the middle of our universe as we are on the WAY outskirts of it.