collapsed into the core, exceeding the maximum mass of a neutron star (NS) and forming a BH," they conclude. About 98% of the star's mass collapsed and created a black hole with about 6.5 solar ...

Active galaxy—A galaxy with an unusually strong output of energy, thought to be powered by a supermassive black hole in its core. Andromeda Galaxy—The nearest large spiral galaxy to the Milky ...

It will collide with Andromeda (M31), the nearest spiral ... with a binary system of two supermassive black holes at its core (a binary which will, eventually, also merge into one supermassive ...