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Measuring a shocking velocity.

Astronomers working with HUT have also calculated the speed of a shock wave plowing through interstellar space from the Cygnus Loop, a supernova remnant about 26,000 light-years from Earth. The supernova's shock wave proved energetic enough to strip five of eight electrons from atomic oxygen gas and induced these ionized atoms to emit the ultraviolet light detected by HUT, reports Arthur F. Davidsen of Johns Hopkins University. Equating the energy of the emitted ultraviolet light with the kinetic energy of the passing shock wave, Davidsen's team estimates that the wave was speeding along at 168 kilometers per second.
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Title Annotation:speed of a supernova's shock wave calculated
Author:Cowen, Ron
Publication:Science News
Date:May 4, 1991
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