News Archives Astrobiology Science News 16 July 2008 By Keith Cowing July 16, 2008 On the complementarity of astrometric and radial velocity exoplanet observations – Determining exoplanet mass with astrometric snapshots, astro-ph Transits and secondary eclipses of HD 189733 with Spitzer, astro-ph Signals from an Infant Earth, Astrobiology Magazine Keith Cowing SpaceRef co-founder, Explorers Club Fellow, ex-NASA, Away Teams, Journalist, Space & Astrobiology, Lapsed climber. Follow on Twitter