Coalsack

(kōl′sak′)

noun

Astron. a prominent dark nebula in the Milky Way near the constellation Crux: usually with the

sometimes written Coal Sack

See Coalsack in American Heritage Dictionary 4

noun

A dark nebula, one of the nearest to Earth, that appears in the southern Milky Way.
A similar dark nebula in the Northern Hemisphere near the constellation Cygnus.

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