Lots More Information

Sources

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  • "Rare Earth Debate Part 1: The Hostile Universe." Space.com. July 15, 2002. (Aug. 9, 2010) http://www.space.com/scienceastronomy/rare_earth_1_020715.html
  • Schirber, Michael. "Alien Life May Need More Than Liquid Water to Survive." Space.com. May 20, 2010. (Aug. 9, 2010) http://www.space.com/scienceastronomy/alien-life-needs-more-than-water-100520.html
  • Villard, Ray. "Is Earth one of a kind?" Astronomy. April 2009. (Aug. 9, 2010) http://www.astronomy.com/asy/default.aspx?c=i&id=467