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.

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.

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 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 …

Dec 11, 2025 · Astronomers challenge 50-year-old quasar law by Sam Tonkin, Royal Astronomical Society edited by Lisa Lock, reviewed by Robert Egan Editors' notes

Apr 14, 2025 · A quasar is an extremely bright galactic core powered by a supermassive black hole, emitting massive energy as gas spirals inward, outshining entire galaxies.

Mar 16, 1998 · The word 'quasar' is a contraction of 'quasi-stellar radio source'. The first quasars were discovered in the early 1960s, when astronomers measured their very strong radio emissions.

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