- 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.