Wiktionary
supermassive black holes
n. (supermassive black hole English)
Usage examples of "supermassive black holes".
If Arp is right, the exotic mechanisms proposed to explain the energy source of distant quasars - supernova chain reactions, supermassive black holes and the like - would prove unnecessary.
Multiple collisions between these neutron stars will form supermassive black holes whose gravity will suck in everything until there is no matter, no radiation, nothing.