Galactic Supernova Remnant IC 443 . ... Ancient humans might have noticed the supernova as a temporary star, but modern humans can see the expanding shell of gas even today. ... Of particular interest, though, are the wisps of IC 443 colored red, as they are impacting an otherwise normal molecular cloud . Here emission from shock-excited molecular hydrogen is allowing astronomers to study how fast moving supernova gas affects star formation in the cloud. ... NASA Official: Jay Norris. ...