The unique heated iron gas center was once a star. Until iron I.E. the last stage of nuclear fusion V.I.A star nucleosynthesis. Began taking up space replacing any hydrogen gases that can be used as helium3. Then KABOOM! the star gives out due to its own hydrogen exhastion. Then all the other gases shoot out that are mid to external. Then the other gases already reached lightyears or some what close to a light year. Or (AU) Astronomical Unit(s). Then the iron's visible. #3d #Nebula #IronsBest