The Cocoon Nebula (IC 5146) is located in Cygnus, fully in the Milky Way. At about 4000 light years from us, it extends across a dozen light years and is outlined by dark clouds of gas and dust with a sinuous extension to the right of the image that masks background stars.
Chapter 7
Imaging Deep-Sky Objects
Grouped under the term deep-sky are all celestial objects other than the sun, the moon, and the planets. This group includes constellations, star clusters, nebulae, galaxies, and even comets and asteroids, the latter because even though they belong to the solar system, they are photographed with the same techniques used for nebulae and galaxies. ...
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