This is one part of the large nebular complex known as the Veil Nebula.  The Veil Nebula is a supernova remnant from a star that exploded about 10,000 years ago.  From the estimated visible mass of the nebula, it is likely that the supernova resulted in a neutron star, and not a black hole.  However, such a body has not been positively identified.

Supernova remnants are the major source of galactic cosmic rays, which are (usually) protons that have been accelerated to unbelievable speeds approaching the speed of light.  (“Rays” is really a misnomer, since they are not composed of photons but of simple protons – hydrogen nuclei – or, less commonly, helium nuclei.)  According to this article, it happens as follows:
A massive star exploding as a supernova will produce an expanding shock wave in the interstellar medium. A particle crossing the shock front gains an increase in speed of about 1%. This is not much but it can become important for multiple crossings that can be induced when a turbulent magnetic field deflects a charged particle in a random walk process. A particle that crosses the shock discontinuity many times can gain enough energy to break free and escape into the Galaxy – becoming a cosmic ray.
Put another way: With trillions upon trillions of particles crossing multiple shock waves, a tiny number of them will by chance be randomly accelerated in the same direction hundreds of times, and then speed off to eventually smash into the Earth’s atmosphere.

Although the entire Veil Nebula complex is quite large, spanning about 3° of the sky (6 times the size of the full moon), like most supernova remnants it is very dim, and difficult to see visually through a telescope.  This image encompasses less than half of what visually looks somewhat like a cracked eggshell.

This image is largely bi-color because in addition to the hydrogen alpha emission wavelength (standard for nebulae), almost all of the light emitted from the nebula is emitted at the wavelength of OIII, doubly-ionized oxygen (meaning the electrons are dropping two levels to emit photons).  Oxygen gas clouds are generally more diffuse than hydrogen, yielding  vaporous, translucent, wispy structures, as seen here.

The Veil Nebula is about 2400 light years away, and has a diameter of about 130 light years.  It is located in the constellation of Cygnus, which is one of the 49 classical constellations  described by Ptolemy.