Quasars
Concept
Extremely luminous active galactic nuclei, powered by supermassive black holes accreting gas, outshining their host galaxies and often producing jets.
Mentioned in 2 videos
Videos Mentioning Quasars

Avi Loeb: Aliens, Black Holes, and the Mystery of the Oumuamua | Lex Fridman Podcast #154
Lex Fridman
Very bright, point-like light sources at galactic centers, hundred times brighter than their host galaxy, suggested to be black holes accreting gas.

Martin Rees: Black Holes, Alien Life, Dark Matter, and the Big Bang | Lex Fridman Podcast #305
Lex Fridman
Extremely luminous active galactic nuclei, powered by supermassive black holes accreting gas, outshining their host galaxies and often producing jets.