In August of 2007 astronomers located a gigantic hole in the universe. This empty space, stretching nearly a billion light-years across, is devoid of any matter. A radical and controversial theory proposes that it is a "Universe-in-mass Black hole"
Even science doesn't know it all. Knowledge increases, even when there are established "facts". <- science is a tool that allows us to know more about our universe, but unfortunately our knowledge is restricted to the technology and knowledge we can use.