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barred spiral galaxy

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barred spiral galaxy

–noun Astronomy.
a spiral galaxy whose center has the form of an extended bar.
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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Science Dictionary
barred spiral galaxy   (bärd)  Pronunciation Key 
A spiral galaxy with a barlike bulge in the center, extending between the core and the spiral arms. About a third of spiral galaxies have this straight bar of stars, gas, and dust extending out from the nucleus. As with other spiral galaxies, barred spiral galaxies rotate, and new stars form from the dust and gas in their arms. Astronomers believe that some elliptical galaxies containing hints of a bar and spiral might once have been barred spiral galaxies.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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