IRVINE, California, Feb. 14 -- The University of California Irvine campus issued the following news release: * * * UC Irvine astronomers gauge livability of exoplanets orbiting white dwarf stars Computer model comparison reveals rotational factors contributing to habitability Among the roughly 10 billion white dwarf stars in the Milky Way galaxy, a greater number than previously expected could provide a stellar environment hospitable to life-supporting exoplanets, according to astronomers at  more