QUASARS

 

  Quasars are the super bright cores of galaxies that are otherwise invisible.They are the brightest objects in the Universe,giving off thousand of times of more light than normal galaxy.The luminosity is thought to be generated by super massive black holes at the center of the Quasars.These black holes are many billion times the mass of the Sun.Six thousand quasars have been discovered from the universe.Some are thought to be formed from the collisions between neighbouring galaxies.