Mysterious objects emitting radio waves were first identified in 1963 by radio astronomers who called them quasi-stellar radio sources, or quasars. Their origin was debated for a long time, but quasars are now thought to be extremely bright discs of matter swirling around supermassive black holes at the centres of distant galaxies.
Quasars are often so bright that they drown out any light from the galaxies surrounding them, giving them a star-like appearance from our perspective on Earth.
NOTE: Above information has been taken from wikipedia and/or official websites of topics.
Astronomers using NASA’s Hubble Space Telescope have found that Markarian 231 (Mrk 231), the nearest ...DetailsMore Onlines