IC 443 is a supernova remnant located in the constellation Gemini. It is sometimes nicknamed the Jellyfish Nebula because of its filamentary, flowing structure that resembles a drifting jellyfish in space. The nebula is thought to be the remains of a massive star that exploded between about 3,000 and 30,000 years ago.

IC 443 spans roughly 70 light-years across and lies about 5,000 light-years from Earth. Its complex shape is the result of the expanding shock wave from the supernova interacting with surrounding interstellar material, including dense molecular clouds. These interactions create intricate structures of gas and dust, as well as regions of high-energy emission detectable in X-rays and radio waves.

At the heart of IC 443 is likely a compact remnant left behind by the explosion, possibly a neutron star. One candidate is the X-ray source CXOU J061705.3+222127, which may be a high-velocity neutron star moving away from the explosion site. 

Today, IC 443 continues to expand and evolve, gradually dispersing its material into space. Over time, this enriched gas will contribute to the formation of new stars and planetary systems, continuing the cycle of stellar birth and death in our galaxy.

Source: https://en.wikipedia.org/wiki/IC_443