"A quasar is an extremely luminous active galactic nucleus (AGN). It is sometimes known as a quasi-stellar object, abbreviated QSO. The emission from an AGN is powered by accretion onto a supermassive black hole with a mass ranging from millions to tens of billions of solar masses, surrounded by a gaseous accretion disc. Gas in the disc falling towards the black hole heats up and releases energy in the form of electromagnetic radiation." "Kwazar to potężne kosmiczne monstrum, które powstaje w sytuacji, gdy super masywna czarna dziura będąca sobie w samym centrum galaktyki wpada w bezwzględny szał karmienia się."