Great Seahorse Of Doom western edge of the Veil Nebula, filaments of shocked, glowing gas draped across 1,470 light years of the sky in the direction of the Cygnus Constellation. To wit:
The Veil Nebula itself is a large supernova remnant, an expanding cloud born of the death explosion of a massive star. Light from the original supernova explosion likely reached Earth over 5,000 years ago. Blasted out in the cataclysmic event, the interstellar shock wave plows through space sweeping up and exciting interstellar material. The glowing filaments are really more like long ripples in a sheet seen almost edge on, remarkably well separated into atomic hydrogen (red) and oxygen (blue-green) gas. Also known as the Cygnus Loop, the Veil Nebula now spans nearly 3 degrees or about 6 times the diameter of the full Moon. While that translates to over 70 light-years at its estimated distance of 1,500 light-years, this telescopic image of the western portion spans about half that distance. Brighter parts of the western Veil are recognised as separate nebulae, including The Witch’s Broom (NGC 6960) along the top of this view and Pickering’s Triangle (NGC 6979) below and left.