Part of the large supernova remnant known as The Veil Nebula
in the constellation Cygnus, Pickering's Triangle displays
hydrogen (red) and oxygen (blue) that was dispersed into the
galaxy by a star that exploded 5,000 to 10,000 years ago.

Image data:
Telescope: 12.5" Hyperion
Camera: SBIG STXL 11002
Exposure: 6 hours through RGB, Hydrogen-alpha, and Oxygen-III filters