Number 96 (Story #3), September 29, 1992 by Phillip F. Schewe and Ben Stein TRITON'S GEYSERS AND HALLEY'S FLASH may be caused by the change of nitrogen ice from one crystalline form to another, according to Tobias Owen of the University of Hawaii. Owen believes that the venting of heat which occurs when nitrogen ice (an important ingredient in outer-solar-system object like Pluto and comets) shifts may drive the 8-km high geysers spewing from Triton's surface (as seen in 1989 by Voyager 2 on its way past Neptune) and the brightening of Comet Halley (1991) long after its swing past the Sun. (Science News, 19 Sept. 1992.)