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Southern Coalsack

noun, Astronomy.
1.

Coalsack

or Coal Sack

[kohl-sak] /ˈkoʊlˌsæk/
noun, Astronomy.
1.
a dark nebula in the southern constellation Crux, whose dust particles obscure light from Milky Way stars behind it.
Also called Southern Coalsack.
Origin of Coalsack
1625-1635
1625-35; coal + sack1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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