Quasar

A quasar (also known as a quasi-stellar radio source) is an extremely luminous active galactic nucleus (AGN). Quasars are among the most energetic and distant objects in the known universe, emitting energy in the form of electromagnetic radiation, including visible light, X-rays, and radio waves. The term "quasar" is derived from the phrase "quasi-stellar radio source," reflecting their initial identification as star-like objects emitting radio waves. In Hebrew, a quasar is referred to as קוואזאר (pronounced "kvazar"). In other languages, a quasar is called quasar in Spanish, quasar in French, Quasar in German, and クエーサー (pronounced "kuēsā") in Japanese. Quasars are believed to be powered by supermassive black holes at the centers of galaxies, with the energy generated by the accretion of matter into these black holes. They provide valuable insights into the early universe, as their light has traveled billions of years to reach Earth, offering a glimpse into the conditions and processes that occurred shortly after the Big Bang.