Accretion Disk
From Conservapedia
An accretion disk is the term for a rapidly rotating disk of material that forms around a high-mass compact object, such as a white dwarf star or neutron star.[1] In order to conserve angular momentum, as material in the disk moves towards the central mass, its rotational speed increases as does its temperature. As a result, accretion disks often emit radiation in the x-ray and gamma ray portions of the electromagnetic spectrum.
