Their light energy is only visible at the center of the galaxy they reside in, with their radio wave emissions visible for light years. This light has been shown to result from starlight located in the quasar's host galaxy, resulting in a haze of light surrounding the quasar. They exist for only a couple billion years, the early part of a galaxy's life. This may seem like an eternity to us humans, but in the galactic long run, this period of time is relatively short. When they finally die, it is believed that black holes result as the matter collapses and as the gaseous energy runs out.
Quasars provide an awful lot to admire in a relatively small package.
Their incredible radiation, energy, and luminosity have attracted the attention of astronomers the world over. As science continues to advance alongside improved technology, questions about quasars will be answered, and new ones will arise in the shadow of discovery. It just goes to show you that the heavens that the Earth inhabits provide a phenomenal outlet for discovery. Even though you can't see quasars with the naked eye, you only need to look up toward the heavens on a clear night to immerse yourself to what is beyond the Earth's horizon. Keep searching for that second star to the right, and keep on going straight till morning.