Located about 6,000 light-years from Earth, the Heart and Soul nebulae form a vast star-forming region in the constellation Cassiopeia. Read on for a bit more techie information on the image.

This image uses two narrowband filters. Hydrogen alpha (Ha) is red in this image and Oxygen (OIII) is blue. H-alpha light is emitted by hydrogen atoms. When electrons within those atoms absorb energy from nearby stars, they rise to a higher energy level or orbit. When they fall back to their original orbits, they release that energy as reddish light with a wavelength of 656nm. With the Ha filter on my camera everything except light in that particular wavelength is blocked out. So we only see areas of Hydrogen gas that are emitting Ha light. It works the same way for Oxygen. The wavelength of OIII light is about 500nm which we see as a greenish blue color.