Quasar, an astronomical object of very high luminosity found in the centres of some galaxies and powered by gas spiraling at high velocity into an extremely large black hole. The brightest quasars can outshine all of the stars in the galaxies in which they reside, which makes them visible even at distances of billions of light-years. Quasars are among the most distant and luminous objects known.Six
quasar host galaxies, as observed by the Hubble Space Telescope.Shown
are apparently normal, solitary galaxies (left), colliding galaxies
(centre), and merging galaxies (right).Photo AURA/STScI/NASA/JPL (NASA photo # STScI-PRC96-35a) The term quasar derives from how these objects were originally
discovered in the earliest radio surveys of the sky in the 1950s. Away
from the plane of the Milky Way Galaxy, most radio sources were identified with otherwise normal-looking galaxies. Read More
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