Ultraviolet astronomy, once the province of instrumentalists, has become an accessible and necessary technique for all astronomers. In the first three years after the 1972 launch of the Copernicus satellite about 100 astronomers used its ultraviolet‐spectrometer data, outnumbering by a factor of ten the core group of Princeton University scientists who superintended the instrument. In the first two years of observational programs with the most recent ultraviolet satellite, the International Ultraviolet Explorer (IUE), this involvement of non‐experimenters has mushroomed, with more than 500 scientists participating.

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