The accelerated expansion of our universe is only apparent? Our visible universe is in fact contained in a larger system, and orbiting a ginormous black hole that sucks in galaxies at the edge of our observable universe? Well, maybe, according to this interesting story at "The Daily Galaxy".
This theory is a proposed explanation for huge observed voids out there, where there not only appears to be no matter, but the cosmic background radiation is significantly less.
Key graphs (read the whole thing):
The apparent development of a large void of some billion light-years in diameter in the Constellation Eridanus appears to be improbable given current cosmological models. A radical and controversial theory proposes that it is a "universe-in-mass black hole" rather than hypothetical dark matter responsible for the phenomenon described as the expanding-accelerating universe. This radical theory of cosmology suggests that stars at the edge of the Hubble length universe are being consumed by a universe-in-mass black hole...
..A contrary theory proposed in the controversial Journal of Cosmology suggests that our observable universe orbits a super-supermassive hole just as the stars of entire galaxies orbit and eventually are swallowed by the supermassive black holes at their center. Like the stars closest to the black hole at the center of the Milky Way galaxy which have a greater velocity than stars on the outer arms (where the Earth is located), stars at the edge of our known, Hubble-length universe, orbit one of these "universe-in-mass holes" at a greater velocity than those stars further away thus effecting the red shift and dimness of light and creating the illusion the universe is accelerating and exanding.