This is about 1/3rd of the large Veil Nebula. Like many nebulae, the Veil is the remnants of a supernova, the material ejected when a star exploded. It is in the constellation Cygnus, but its distance from Earth is not precisely known.
This image from late October of 2013 replaces an older version. The new version adds an S-
Scope: AT111EDT at f/5.6
Mount: AP Mach1
Camera: QSI 583wsg at –
Exposure: 12 x 900s H-