What is a Quasar?

About Quasar:

• A quasar is an extremely active and luminous type of active galactic nucleus (AGN). 
• An AGN is nothing more than a supermassive black hole that is active and feeding at the center of a galaxy. 
• 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 thought to form in regions of the universe where the large-scale density of matter is much higher than average.
• Most quasars have been found billions of light-years away. 
• Quasars emit energies of millions, billions, or even trillions of electron volts. This energy exceeds the total of the light of all the stars within a galaxy. 

Q1)  What is a Black Hole?

A black hole is a place in space where gravity pulls so much that even light can not get out. The gravity is so strong because matter has been squeezed into a tiny space. This can happen when a star is dying.

Source: Hubble discovers unexpected double quasar in early universe

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