If you had, on average, space that was filled with a uniform amount of stationary ... what if the black hole also has angular momentum, instead of mass alone — wasn't solved until Roy Kerr ...

The disk-instability model 9,10,11,12,13,14 was developed to explain outbursts in compact binaries in which a white dwarf accretes from a low-mass companion 15. A cool (neutral) quiescent disk is ...

While the composition of gas and dust in a precursor molecular cloud is fairly uniform before ... gas flattened into a disk as it spun with the angular momentum of the system.

We know from the cosmic microwave background that the distribution of matter wasn’t uniform ... to have sufficient angular momentum to orbit it, forming the accretion disc from which planets ...