![]() ![]() Once the accretion disk is used up, they become passive. Quasars tend to have accretion discs of gas and dust when material from the disc falls into the quasar, they are ejected as electromagnetic radiation. Quasars are large supermassive black holes at the centre of a galaxy that is so active, that it tends to outshine the stars in the galaxy. Both are starlike in appearance, and both are outside our galaxy. An object may or may not have a radio source. On the other hand, Radio Sources will also have a strong radio source. There are also Quasi-Stellar Objects (QSO) which are like Radio (QSR) sources except that Objects have a large redshift in their optical spectrum. It is now thought that at one time, the centre of the Milky Way was a Quasar before it became inactive like it is today. The centre of the Milky Way is reputed to be just a supermassive black hole and not a quasar. ![]() Quasars full name is QUASi-StAllar Radio object. A Quasar is just one of a number of different Active Galactic Nuclei which also include Blazars, Radio Galaxies and Seyfert Galaxy.
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