Eastern Veil Nebula

The eastern arc of the Veil Nebula supernova remnant in Cygnus, also known as Caldwell 33. The entire Veil complex is the expanding debris from a massive star that exploded roughly 8,000 years ago, now spanning about 3° of sky — too large for most telescopes in a single frame. This eastern section shows intricate shock-front filaments where the expanding blast wave ploughs into the surrounding interstellar medium, lighting up oxygen (blue-green) and hydrogen (red) in dramatic detail.