Sky science
Quasar
Direct answer
Quasar: A Quasar is an extremely luminous active galactic nucleus observed across cosmological distances and powered by black-hole accretion.
It is a bright distant form of active galaxy.
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At a glance
- Found in
- Astronomy & Skywatching
- Related
- Irregular Galaxy, Active Galactic Nucleus, Gravitational Lensing, Astronomy
It is a bright distant form of active galaxy.
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The story behind Quasar
Their large redshifts transformed quasi-stellar radio sources into markers of a vast evolving universe.
A one-minute story
The Wandering Stars
How the moving planets were watched, named and found, and what a transit is.
Why Quasar matters
Quasars illuminate the early universe, intergalactic gas, and rapid black-hole growth.
Quasar in practice: an example
A distant quasar can appear pointlike while outshining its entire host galaxy.
Where readings of Quasar go wrong
Quasars are not stars and redshift interpretation requires calibrated spectra.
Sources and editorial method
Research references used for this entry include:
- NASA Science: Galaxies - NASA overview of galaxy structure, types, groups, clusters, and the Milky Way.
- NASA Science: Black Holes - NASA reference for black-hole properties, accretion, detection, and gravitational effects.
- Source
- The Great Almanac Dictionary
- Category
- Astronomy & Skywatching
- Last updated
- 2026-09-26
Look beyond a quasar’s star-like image
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Common questions
What is a Quasar?
A Quasar is an extremely luminous active galactic nucleus observed across cosmological distances and powered by black-hole accretion.
What do people get wrong about a Quasar?
Quasars are not stars and redshift interpretation requires calibrated spectra.
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