Article: Supernova encounter of a third kind.

Supernovas are usually discovered by accident: Astronomers looking at a particular galaxy notice a bright object that was not there before. So it happened to Alexei V. Filippenko of the University of California at Berkeley and Wallace L. W. Sargent of Caltech in Pasadena. They were making a spectroscopic survey of nearby galaxies. On Feb. 28, as they observed galaxy NGC4618, their spectroscope recorded a bright object near the center of that galaxy. The object, now catalogued as SN1985f, has aroused a great deal of interest within the astronomical community. With properties quite different from those of either of the two classes of supernova that astronomers have ...

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