Sky science
Irregular Galaxy
Direct answer
Irregular Galaxy: An Irregular Galaxy lacks the ordered spiral or elliptical appearance used in basic morphological classification.
It is a galaxy without a regular large-scale form.
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At a glance
- Found in
- Astronomy & Skywatching
- Related
- Spiral Galaxy, Elliptical Galaxy, Active Galactic Nucleus, Quasar
It is a galaxy without a regular large-scale form.
A scientific orientation to scale, light, or motion; the article supplies the precise definition.
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The story behind Irregular Galaxy
Galaxy catalogues retained an irregular class for systems that resisted the main visual sequence.
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Why Irregular Galaxy matters
Irregular Galaxy’s structure can expose interaction, intense star formation, low mass, or asymmetric gas dynamics.
How to read Irregular Galaxy
Do not treat irregular as physically uniform; investigate the cause of the morphology.
Irregular Galaxy in practice: an example
The Large Magellanic Cloud has asymmetric structure shaped partly by interaction.
Where readings of Irregular Galaxy go wrong
Irregular does not mean unimportant, young, or entirely without rotation.
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: Universe Glossary - NASA definitions for common stellar, galactic, orbital, and high-energy astronomy terms.
- Source
- The Great Almanac Dictionary
- Category
- Astronomy & Skywatching
- Last updated
- 2026-09-26
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Common questions
What is an Irregular Galaxy?
An Irregular Galaxy lacks the ordered spiral or elliptical appearance used in basic morphological classification.
What do people get wrong about an Irregular Galaxy?
Irregular does not mean unimportant, young, or entirely without rotation.
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