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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 William Tyler Olcott

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 Thomas Hardy

By all the devils of the Coal Sack," he shouted, "the man doesn't live who can take me alive!

From Runaway by William Ashman

This gulf of Cimmerian darkness was called by early navigators the Coal Sack.

From The Astronomy of Milton's 'Paradise Lost' by Thomas Nathaniel Orchard

Note "The Coal Sack," one of the dark gap in the Milky Way.

From A Field Book of the Stars by William Tyler Olcott

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