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irregular galaxy
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irregular galaxy
noun Astronomy.
a galaxy with no specific form and a relatively low mass.
Origin:
1960–65
1960–65
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
Cite This Source
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Irregular galaxy
is always a great word to know.
So is light-year. Does it mean:
| a zodiacal constellation between Scorpius and Capricorn also called the Archer |
| the distance traversed by light in one mean solar year, about 5.88 trillion mi. (9.46 trillion km) |
American Heritage
Science Dictionary
| 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.
Cite This Source
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
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