Sky science
Spiral Galaxy
Direct answer
Spiral Galaxy: A Spiral Galaxy is a rotating disk galaxy with stars, gas, dust, and spiral structure around a central region.
It is a disk galaxy patterned by spiral arms.
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At a glance
- Found in
- Astronomy & Skywatching
- Related
- Open Star Cluster, Globular Cluster, Elliptical Galaxy, Irregular Galaxy
It is a disk galaxy patterned by spiral arms.
A scientific orientation to scale, light, or motion; the article supplies the precise definition.
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The story behind Spiral Galaxy
Galaxy classification systems formalized spiral shapes while later physics explained them as evolving patterns.
A one-minute story
The Wandering Stars
How the moving planets were watched, named and found, and what a transit is.
Why Spiral Galaxy matters
Spiral Galaxy’s arms trace density structure, star formation, and galactic dynamics.
Spiral Galaxy in practice: an example
The Milky Way is a barred spiral viewed from inside its disk.
Where readings of Spiral Galaxy go wrong
Spiral arms are not permanent rigid streams containing the same stars forever.
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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More in Astronomy & Skywatching
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Common questions
What is a Spiral Galaxy?
A Spiral Galaxy is a rotating disk galaxy with stars, gas, dust, and spiral structure around a central region.
What do people get wrong about a Spiral Galaxy?
Spiral arms are not permanent rigid streams containing the same stars forever.
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