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Proceedings Article

Astrobiology of comets

[+] Author Affiliations
Richard B. Hoover, Elena V. Pikuta, Robert B. Sheldon

NASA Marshall Space Flight Ctr. (USA) and National Space Science and Technology Ctr. (USA)

Nalin C. Wickramasinghe, Max K. Wallis

Univ. of Wales Cardiff (United Kingdom)

Proc. SPIE 5555, Instruments, Methods, and Missions for Astrobiology VIII, 93 (November 1, 2004); doi:10.1117/12.566496
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From Conference Volume 5555

  • Instruments, Methods, and Missions for Astrobiology VIII
  • Richard B. Hoover; Gilbert V. Levin; Alexei Y. Rozanov
  • Denver, CO | August 02, 2004

abstract

We review the current state of knowledge concerning microbial extremophiles and comets and the potential significance of comets to Astrobiology. We model the thermal history of a cometary body, regarded as an assemblage of boulders, dust, ices and organics, as it approaches a perihelion distance of ~ 1AU. The transfer of incident energy from sunlight into the interior leads to the melting of near surface ices, some under stable porous crust, providing possible habitats for a wide range of microorganisms. We provide data concerning new evidence for indigenous microfossils in CI meteorites, which may be the remains of extinct cometary cores. We discuss the dominant microbial communities of polar sea-ice, Antarctic ice sheet, and cryoconite environments as possible analogs for microbial ecosystems that may grow in sub-crustal pools or in ice/water films in comets.

© (2004) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Richard B. Hoover ; Elena V. Pikuta ; Nalin C. Wickramasinghe ; Max K. Wallis and Robert B. Sheldon
"Astrobiology of comets", Proc. SPIE 5555, Instruments, Methods, and Missions for Astrobiology VIII, 93 (November 1, 2004); doi:10.1117/12.566496; http://dx.doi.org/10.1117/12.566496


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