It's the opposite - galactic hydrogen gas made visible by the presence of a local agglomeration of stars, probably clusters of very hot young stars emitting ultraviolet radiation, which ionizes the surrounding gas and causes it to fluoresce, like a pink neon light. In contrast, supernova remnants are more likely to shine by reflected light.

Good link: [link|http://www.astronomynotes.com/evolutn/s3.htm|http://www.astronom...olutn/s3.htm]