Expansion of SN 1993J

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Science  01 Dec 1995:
Vol. 270, Issue 5241, pp. 1475-1478
DOI: 10.1126/science.270.5241.1475


A sequence of images from very long baseline interferometry shows that the young radio supernova SN 1993J is expanding with circular symmetry. However, the circularly symmetric images show emission asymmetries. A scenario in which freely expanding supernova ejecta shock mostly isotropic circumstellar material is strongly favored. The sequence of images constitutes the first “movie” of a radio supernova.