Number 18 (Story #2), January 23, 1991 by Phillip F. Schewe and Ben Stein TAU NEUTRINOS WERE NOT DETECTED BY THE ASTRO observatory carried on the Space Shuttle Columbia last month. The Hopkins Ultraviolet Telescope, part of Astro's package of instruments, had sought to measure the ultraviolet radiation coming from the presumed decay of tau neutrinos. Oxford theorist Dennis Sciama believes that tau neutrinos, with a nonzero mass, might account for some of the missing mass in the universe. Arthur Davidsen of Johns Hopkins (301-338-7370) said at the American Astronomical Society meeting in Philadelphia that "neutrinos could still have mass and could account for dark matter, but they do not decay at the rate predicted by this theory." (The Washington Post, 18 Jan. 1991.)