Quasars.

Quasars: -

-Crazy Facts Of Cosmology. 

Astronomers have discovered a black hole more massive than any detected before, producing the brightest known quasar in the universe. With a mass about 12 billion times that of the sun.

Quasars are the most distant objects in space. Give off tremendous amounts of energy. They can be a trillion times brighter than the sun!

Quasars are believed to produce their energy from massive black holes in the center of the galaxies in which the quasars are located. Because quasars are so bright, they down out the light from all the other stars in the same galaxy.

Even in a cosmos that contains 100 billion galaxies or more,  one of them has to be the brightest, and astronomers  may have found a winner.

Starlight doesn't cause most of the brightness from this faraway galaxy. Instead,  the light almost certainly comes from a monster quasar. Says Peter Eisenhardt, an astronomers at the NASA Jet Propulsion Laboratory.

From Earth, a quasar can look like a star, but it is really a gigantic black hole that sits in a galaxy's core and sucks in gas so voraciously that the stuff beets up to millions of degrees, creating a beacon that can be seen from across the universe.