An Etymological Dictionary of Astronomy and Astrophysics

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spiral arm

بازوی ِ مارپیچ

bâzu-ye mârpic

Fr.: bras spiral

The region in a → spiral galaxy that contains concentrations of → gas, → dust, and → massive stars. Spiral arms are created by → density waves. See also → density wave theory.

→ spiral; → arm.

An Etymological Dictionary of Astronomy and Astrophysics
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