This is the remnant of a super nova located in the constellation Gemini. Its common name is the "Jellyfish Nebula" because of it undulating shape. A super nova occurs when a star explodes and scatters chemical elements that were created during its lifetime into the surrounding space. In this image you can see the layers of gas expand from the point of the explosion in shells of glowing lattice structures. What we see is the light from an event that happened about 30,000 years ago. I framed this image to feature both the billowing gases of the super nova, as well as the trailing ejecta snaking out from the bow wave of the explosion.
19.2 hours total exposure of ionized hydrogen, oxygen, and sulfur emissions