Published online by Cambridge University Press: 18 July 2016
Extensive progress of radio astronomical methods of investigation during recent years has totally changed our ideas about the nature of the enevelopes ejected during the outburst of super-novae and, consequently, also about the phenomenon of the outburst of the super-nova[1]. The only envelope of a super-nova, investigated in sufficient details by means of optical astronomy, is the Crab nebula (see W. Baade[2], Minkowski[3], Greenstein and Minkowski[4], Barbier[5]. All available explanations concerning the nature of the Crab nebula are based upon these investigations. They were also applied in general to envelopes of other super-novae. Considering the Crab nebula as a typical super-nova remnant let us shortly discuss these statements.