Quasar - Wikipedia
A quasar (/ ˈkweɪzɑːr / KWAY-zar) is an extremely luminous active galactic nucleus (AGN). It is sometimes known as a quasi-stellar object, abbreviated QSO. The emission from an AGN is …
Quasi-star - Wikipedia
A quasi-star (also called black hole star) is a hypothetical type of extremely massive and luminous star that may have existed early in the history of the Universe. They are thought to have lived …
What is a quasar? - EarthSky
2021年2月28日 · The word quasar stands for quasi-stellar radio source. Quasars got that name because they looked starlike when astronomers first began to notice them in the late 1950s …
Astronomers discover a unique quasi-stellar object–dusty star …
2024年11月18日 · In some cases, high-redshift quasars merge with dusty star-forming galaxies (DSFGs). Although such systems are rarely found, they are perceived by astronomers as …
Quasar | Discovery, Structure & Evolution | Britannica
2024年11月9日 · quasar, an astronomical object of very high luminosity found in the centres of some galaxies and powered by gas spiraling at high velocity into an extremely large black …
Quasar - Definition, Formation, Facts in Astronomy - Science …
2024年10月29日 · Quasars are the active cores of distant galaxies, powered by supermassive black holes devouring surrounding matter. First discovered in the 1950s and early 1960s, …
Quasars: Brightest Objects in the Universe - Space.com
2023年10月19日 · Quasars are the remarkably bright cores of active galaxies in the distant universe, they are an extreme form of what astronomers call "active galactic nuclei", or AGN …
Hubble Quasars - Science@NASA
The top row of this image shows a selection of photos from a Hubble survey of 11 ultra-bright quasars that existed at the peak of the universe's star-formation era, 12 billion years ago. …
What Is a Quasar? - Sky & Telescope
2021年9月28日 · A quasar is a supermassive black hole feeding on gas at the center of a distant galaxy. Quasar is short for quasi-stellar radio source, because astronomers first discovered …
What Is a Quasar? The Once-Mysterious Cosmic Object, Explained
2023年6月13日 · Found at the heart of large, ancient galaxies, quasars are supermassive black holes that are so luminous they outshine the sun by as much as 27 trillion times.