Our galaxy, the Milky Way is an average sized galaxy in the Universe and contains 10,000 crore stars. Each galaxy radiates an amount of energy, that makes it visible both visually and also by emission of Radio waves depending on the distance.
A class of objects were discovered known as Quasars (Quasi Stellar Radio Sources) which are exceedingly far away from us with the farthest ULAS J1120+0641 [2] being 1290 crore light years away. At this distance we should not have been able to even know that these objects existed because the energy emission that is required for their identification on Earth would have to be enormous.
These Quasars show swift variations in energy which is possible only when the energy is originating from a compact source. For these light fast variations to occur, the size of its source has to be the size of our solar system or less. With such a small object giving out radiation which is more than 100 times that is being emitted by a whole galaxy is simply unbelievable.
The Quasars are supposed by scientists to be galaxies with super massive black holes at their centers. Due to their vast distances from us we can only detect its super radiating core and nothing else is known about their other properties.
The other properties of Quasars are unknown to us and they remain one of the mysteries of the Universe to Cosmologists.
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