Though we have seen many stars like pulsars, neutron stars, magnetars etc, but quasars are most awesome of all.
They are million to billion times the mass of our sun and it is not bad to say they are super-massive black holes. Every galaxy contains a super-massive quasar at its core or centre and lightens out the whole galaxy. They are oftenly called as "Quasi-Stellar-Radio-Source".
It is millions to millions light years away from us and looks like a star but recent studies shows that they exhibit luminousty equal to thousands of galaxies in the universe.
They were discovered in the early 1960s' when astronomers looked into the sky and focused on the radiations coming from billions of light years away from us.
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