astroengine writes: "One of the most enduring mysteries hanging over astrophysics is how supermassive black holes got so big. The leading theory for black hole evolution is that they sucked in huge quantities of matter that formed an accretion disk. This disk supplied the growing black holes with mass. However, there's not enough time in the Universe for black holes to reach millions (or even billions) of times the mass of our sun. So, researchers from England and Australia have modeled a situation where a primordial black hole feeds on two accretion disks. If there's an inner and outer accretion disk skewed at an angle, as they settle and spread, they collide. The collision of matter causes a rapid slowdown, allowing the gravity of the black hole to take over, consuming up to 1,000 times more mass that it would just by feeding off one accretion disk. This may explain how supermassive black holes, that live in the centers of most galaxies, became so big so quickly shortly after the Big Bang. "We don't know exactly how gas flows inside galaxies in the early universe," said Andrew King of the University of Leicester, "but I think it is very promising that if the flows are chaotic it is very easy for the black hole to feed.""