Cryptic photosynthesis--extrasolar planetary oxygen without a surface biological signature.

@article{Cockell2009CrypticPP,
  title={Cryptic photosynthesis--extrasolar planetary oxygen without a surface biological signature.},
  author={Charles S. Cockell and Lisa Kaltenegger and John A Raven},
  journal={Astrobiology},
  year={2009},
  volume={9 7},
  pages={623-36}
}
On Earth, photosynthetic organisms are responsible for the production of virtually all the oxygen in the atmosphere. On land, vegetation reflects in the visible and leads to a "red edge," which developed about 450 million years ago on Earth and has been proposed as a biosignature for life on extrasolar planets. However, in many regions on Earth, particularly where surface conditions are extreme--in hot and cold deserts, for example--photosynthetic organisms can be driven into and under… CONTINUE READING

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