A quasar can blast out trillions of electron volts. No objects in the universe are brighter. A quasar can put out more energy than all the stars in a galaxy. The strongest of them can shine 100,000 times brighter than our own galaxy, the Milky Way.

Late in the 1950s, astronomers picked up radio signals from specific pin-points in space. Such signals usually come from stars, but these had no stars. Astronomers called them quasi-stellar radio sources, or quasars.

The core of each galaxy is called its nucleus. Through late 2017, a super-massive black hole (SBH) has been found at the center of every discovered nucleus. Because the gravity of a SBH is so immensely strong, any matter that gets too close is sucked in.

Because the SBH also emits energy, the matter—mostly particles of gas—get caught between the forces and swirl around the hole. Gravity eventually sucks it into the hole, where it gets crushed, sending out a lot of all types of energy, including radio waves. This is the "quasar effect".

All quasar effects come from quasi-stellar objects in active galactic nuclei. The three types of AGN are quasars, Seyfert galaxies, and blazars. They are classified by how much energy they emit. The weakest AGN are Seyfert Galaxies. Blazars emit more energy than Seyfert galaxies, and quasars are the brightest objects known..

The image is an artist's depiction of a quasar.

More Info: www.space.com