largest stars known. In addition, Cepheus also has the hyperluminous quasar S50014+81, which hosts an ultramassive black hole in its core, reported at 40 billion
Markarian 501, 4C +71.07, PKS 0537-286 (QSO 0537-286) and S50014+81. Markarian 501 and S50014+81 are also called "TeV Blazars" for their high energy (teraelectron-volt
radio galaxy is believed to have binary supermassive black holes) AP Lib S50014+81 (said to be a compact hyperluminous quasar, estimated at 40 billion solar
the Galactic Center of the Milky Way 1.39 billion years (12.41 Gya): S50014+81, a hyper-luminous quasar, forms 1.4 billion years (12.4 Gya): Age of Cayrel's