E Nebula
The E Nebula, also known as Barnard's E Nebula (catalogued as Barnard 142 and 143), is a pair of dark clouds in the constellation of Aquila. It is a sharply outlined, dark region that stands out from the Milky Way. The apparent size is about 30 minutes of arc, which corresponds to about the diameter of a full moon. The distance is 2'000 light years.

Image on Astrobin: https://www.astrobin.com/47tuj3/
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Sources: https://de.wikipedia.org/wiki/E_Nebula