Quasar luminosities can vary considerably over time, depending on their surroundings. Since it is difficult to fuel quasars for many billions of years, after a quasar finishes accreting the surrounding gas and …

Jun 3, 2025 · Quasars occur when immense amounts of matter fall into a supermassive black hole, spiraling around it in the form of a disk before entering.

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Dec 10, 2025 · 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 hole.

Oct 29, 2024 · Learn what a quasar is in astronomy, how it forms, types of quasars, and what they tell us about the early universe.

Oct 19, 2023 · 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 for short. An active …

Feb 28, 2021 · What is a quasar? 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 …

Quasars are a subclass of active galactic nuclei (AGNs), extremely luminous galactic cores where gas and dust falling into a supermassive black hole emit electromagnetic radiation across the entire …

Oct 22, 2025 · Quasars, short for quasi-stellar radio sources, are extremely bright and distant celestial objects that emit massive amounts of energy. They are considered to be the most luminous objects …

Aug 10, 2024 · Quasars are the brightest objects in the universe, emitting energy up to a trillion times brighter than our Sun. They produce radiation across the entire electromagnetic spectrum, including …