N2359 is a stellar wind-blown shell nebula around the Wolf-Rayet star HD56925.  HD56925 is the bright star located at the center of the main bubble.  This type of star is much more massive and hotter than our Sun.  Wolf-Rayet stars are somewhat rare thus making this nebula an interesting object of study and observation.  This Wolf-Rayet star expels material in an extremely violent stellar wind with velocities approaching 2000 kilometers per second.  The ejected material interacts with the gas and dust around the star producing the bubble structure seen in the image above.  The star is ejecting material at a prodigious rate and cannot sustain its extreme behavior for long.  Thor's Helmet is a spectacular nebula due to its location adjacent to a rich interstellar molecular gas cloud.