According to modified general relativity equations, our universe may be inside a black hole, the black holes in our universe may contain other universes, and the black holes in those universes may contain other universes... I need a drink.
If Indiana University cosmologist Nikodem Poplawski analysis is right, we may be living inside a black hole. His observations on the motion of particles entering black holes suggest that black holes may not be singularities, like Eintein's general relativity theory states, but bridges to different universes:
Maybe the huge black holes at the centre of the Milky Way and other galaxies are bridges to different universes.
According to Poplawski, instead of matter reaching infinite density while going through a black hole, the particles rebound and expand again. This phenomenon, which is based in the Einstein-Cartan-Kibble-Sciama theory of gravity, would explain many of the observations that have puzzled physicists for year and give an explanation to the direction of space-time in our universe. [Science Direct via New Scientist]