Spectroscopic biosignatures

Vegetation's Red Edge: A Possible Spectroscopic Biosignature of Extraterrestrial Plants

Press Coverage The Red Edge: Disover Magazine Blogs: Cosmic Variance, April 22, 2010. Pale Blue Dot III: An Astrobiological Field Report: Astrobiology Magazine, November 27, 2006. Astronomers Get the Spectrum of Earthshine: A Pale Blue Dot Observed from the Ground: SpaceRef.com, January 7, 2002.