Northern Coalsack


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North′ern Coal′sack


n.
a dark nebula in the Northern Cross.
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References in periodicals archive ?
How often have we read that the complex of Milky Way dust clouds composing the Great Rift broadens into the Northern Coalsack, then ends at Deneb?
Appropriately, the true Coalsack is adjacent to the Southern Cross, and the Northern Coalsack lies next to the Northern Cross, which is formed from the Swan's five brightest stars.
At the bulbous northern end of the Great Rift, between Alpha and Gamma Cygni, is the Northern Coalsack.

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