May 1930- Sun Gives Off Ultraviolet Rays

The Optical Journal - Optical News With Independent Views

IT IS fortunate for human beings that the earth revolves around a mild and friendly sun instead of around some other of the suns which astronomers discover among the stars. Dr. B. P. Gerasimovic of Harvard Observatory has just reported, for example, some of these other suns which would sunburn every creature on earth to death in a few seconds because of their enormous output of ultra-violet rays.