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Coal Sack

British  

noun

  1. a dark nebula in the Milky Way close to the Southern Cross

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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This dark space has been called the "Coal Sack."

From A Field Book of the Stars by Olcott, William Tyler

Surrounding δ, ε, ζ, and λ, which mark the king's head, is a vacant space in the Milky Way, similar to the Coal Sack of Cygnus.

From A Field Book of the Stars by Olcott, William Tyler

In the Milky Way, near the Southern Cross, occurs a terrible circular abyss, the Coal Sack.

From The Blue Lagoon: a romance by Stacpoole, H. De Vere (Henry De Vere)

There is a still more remarkable one south of the equator, called the Coal Sack, as a sort of nickname that has a farcical force from its very inadequacy. 

From Two on a Tower by Hardy, Thomas

The most remarkable of these holes is one in the neighbourhood of the Southern Cross, known as the "Coal Sack in Crux."

From Astronomy of To-day A Popular Introduction in Non-Technical Language by Dolmage, Cecil Goodrich Julius

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