Celestial odd couple baffles astronomers

New Scientist Breaking News - Celestial odd couple baffles astronomers

Strange to me ... that these two supernova envelopes appear to have flat polygonal sides.... on closer examination .. the green area inside the smaller envelope has 4 of 6 "edges" that are roughly parallel to the sides of it's outer envelope.... AND the second supernova envelope occludes the two missing "edges" of the smaller supernova envelope, so you can't tell if they would be parallel too .....