Composite image of the Medulla Nebula, also known as CTB-1. This celestial object was formed from the remnants of a supernova. It was named after its brain-like shape and is located in the constellation of Cassiopeia. The supernova that gave rise to the Medulla Nebula occurred approximately 10,000 years ago, leaving behind a gas shell that is expanding into a patchy region of gas and dust. The nebula also contains fainter filaments that are likely the remains of even older supernovas. This deep sky object is extremely faint. Over 130 hours of exposure time, two different telescopes and special filters that isolate light from sulphur (yellow), hydrogen (red), and oxygen (blue), were used to obtain this image.