This filament glows brightly in green wavelengths of light, which are primarily produced by oxygen emission lines. The speed of this filamentΓÇöit is moving at 1,500 kilometers per secondΓÇöindicates that it was ejected from the core of the progenitor star and has remained more or less intact. Regions such as this allow scientists to examine material that was inside the massive star just before it became a supernova.
