This is not the super human character Quasar, but a real tip of Black hole and the most powerful know by science. So here's the thing: A sun billions of times bigger than the sun explodes and become a Quasar, it's very close to earth and it's treating not only i'ts existence but our Solar System as well. Superman (in this case) is the only thing between the Quasar and the destruction of Earth, since The Specter is wasting his time playing chess with Michael Demiurgos.
Superman then travels to the Quasar trying to defeat it.
A quasi-stellar radio source ("quasar", /ˈkweɪzɑr/) is a very energetic and distant active galactic nucleus. Quasars are extremely luminous and is a compact region in the center of a massive galaxy surrounding its central supermassive black hole. Its size is 10–10,000 times the Schwarzschild radius of the black hole. The quasar is powered by an accretion disc around the black hole. They tend to inhabit the very centers of active, young galaxies, and are among the most luminous, powerful, and energetic objects known in the universe, emitting up to a thousand times the energy output of the Milky Way, which contains 200–400 billion stars.