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spiral arm
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spiral arm
noun Astronomy.
any of the elongated and curved spiral sections that are connected to the center of a spiral galaxy.
Origin:
1910–15
1910–15
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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Spiral arm
is always a great word to know.
So is galaxy. Does it mean:
| a large system of stars held together by mutual gravitation and isolated from similar systems by vast regions of space |
| a zodiacal constellation between Aries and Aquarius also called the Fishes |
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