Abstract
A recently discovered supernova, designated SN 1993J, has been imaged with exceptional resolution with a sensitive array of radiotelescopes. As Chevalier discusses in his Perspective, the imaging results reported by Marcaide et al. in this issue ( p. 1475 ) directly show the expansion of a highly symmetrical spherical shock wave. Variations in radio emission around the expanding shell may enable astronomers to learn more about these very energetic explosions.
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