Quasar

 

Quasar
Credits - NASA

A quasar is an enormously bright object at the edge of our universe that emits massive amounts of energy. In an optical telescope, quasars appear point-like, similar to stars, from which they derive their name (quasar = quasi-stellar). Many astronomers believe that quasars are the most distant objects yet detected in the Universe. Current theories hold that quasars are one type of active galactic nuclei (AGN), which is a class of galaxies that spew massive amounts of energy from their centers, far more than ordinary galaxies. Many astronomers believe that supermassive black holes may lie at the center of these galaxies and power their explosive energy output.