IC 443, the Jellyfish Nebula, is a supernova remnant located in the constellation of Gemini. The brightest section of the nebula, at lower right, is 45 arcminutes from Propus (Eta Geminorum), the brightest star in the field of this photo. Propus is a magnitude 3.7 triple variable star that is a red giant of the spectral type M3. IC 443 is located 5,000 light-years from Earth and is 75 light-years across. It was discovered photographically by German astronomer Max Wolf in 1892. The supernova that formed IC 443 is thought to have occurred more than 30,000 years ago leaving behind a neutron star that is a pulsar. The nebula is an expanding debris cloud from that supernova explosion.