News Archives Astrobiology Science News 28 May 2008 By Keith Cowing May 28, 2008 Size-sorting dust grains in the surface layers of protoplanetary disks, astro-ph Abundance and diversity of microbial life in ocean crust, Nature NASA Solicitation: Research Opportunities for Fundamental Space Biology Investigations in Microbial Plant and Cell Biology Keith Cowing SpaceRef co-founder, Explorers Club Fellow, ex-NASA, Away Teams, Journalist, Space & Astrobiology, Lapsed climber. Follow on Twitter