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irregular galaxy

noun, Astronomy.
a galaxy with no specific form and a relatively low mass.
Origin of irregular galaxy
First recorded in 1960-65 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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irregular galaxy in Science
irregular galaxy  
A galaxy that does not have the clearly defined shape and structure of typical elliptical, lenticular, or spiral galaxies. Irregular galaxies typically contain large amounts of gas and dust, and their stars are often young. They account for only a small percentage of known galaxies. Some irregular galaxies are the result of gravitational interactions or collisions between formerly regular galaxies. Many irregular galaxies orbit larger regular ones; the Magellanic Cloud galaxies orbiting the Milky Way are examples. Compare elliptical galaxy, lenticular galaxy, spiral galaxy. See more at Hubble classification system.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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