... Flanked by two bright stars, Mu and Eta Geminorum, at the foot of a celestial twin , the Jellyfish Nebula is the brighter arcing ridge of emission with dangling tentacles below and right of center. In fact, the cosmic jellyfish is seen to be part of bubble-shaped supernova remnant IC 443 , the expanding debris cloud from a massive star that exploded . ... Publications with keywords: supernova remnant - emission nebula . Publications with words: supernova remnant - emission nebula . ...