News Archives Astrobiology News 5 April 2007 By Keith Cowing April 5, 2007 Detecting and Characterizing Planetary Systems with Transit Timing An Extrasolar Planet Census with a Space-based Microlensing Survey Keith Cowing SpaceRef co-founder, Explorers Club Fellow, ex-NASA, Away Teams, Journalist, Space & Astrobiology, Lapsed climber. Follow on Twitter