Coal sack

Coalsack

[kohl-sak]
noun Astronomy.
a dark nebula in the southern constellation Crux, whose dust particles obscure light from Milky Way stars behind it.
Also, Coal Sack.
Also called Southern Coalsack.


Origin:
1625–35; coal + sack1

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World English Dictionary
Coal Sack
 
n
a dark nebula in the Milky Way close to the Southern Cross

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