Black Holes and Compact Objects

Collapsed stellar remnants, split by mass into stellar-mass black holes, formed from a single massive stars collapse, and supermassive black holes, found at the center of galaxies including the Milky Ways own. Belongs here: any entry whose defining nature is a collapsed, non-luminous compact object. Does not belong here: the living star that will one day become one, grouped under Stars, or the supernova remnant left by a collapse that did not form a black hole, grouped under Nebulae.