Quasars
Quasars, or quasi-stellar radio sources, are incredibly luminous objects in the universe, believed to be powered by Supermassive black holes at the centers of galaxies. They are among the brightest objects in the universe, outshining entire galaxies and emitting massive amounts of energy across the entire Electromagnetic spectrum. The study of quasars has helped astronomers understand more about Cosmic distance markers, Planetary motion, and the formation and evolution of galaxies. Quasars are also used as tools for studying the Interstellar medium and the properties of Dark matter and Dark energy. The discovery of quasars has been instrumental in shaping our understanding of the universe, and continued research into these phenomena is ongoing, with organizations like NASA playing a key role.