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Habitability on planetary surfaces: interdisciplinary preparation phase for future Mars missions

Published online by Cambridge University Press:  30 July 2009

Z. Peeters ,
R. Quinn ,
Z. Martins ,
M.A. Sephton ,
L. Becker ,
M.C.M. van Loosdrecht ,
J. Brucato ,
F. Grunthaner  and
P. Ehrenfreund
Z. Peeters
Affiliation:
Leiden Institute of Chemistry, Einsteinweg 55, 2333 CC, Leiden, The Netherlands NASA Goddard Space Flight Center, Code 691, Greenbelt, MD 20771, USA
R. Quinn
Affiliation:
SETI Institute, NASA Ames Research Center, Moffett Field, CA 94035, USA
Z. Martins
Affiliation:
Department of Earth Science and Engineering, Imperial College London, London SW7 2AZ, UK
M.A. Sephton
Affiliation:
Department of Earth Science and Engineering, Imperial College London, London SW7 2AZ, UK
L. Becker
Affiliation:
John Hopkins University, 3400 North Charles St, Baltimore, MD 21218, USA
M.C.M. van Loosdrecht
Affiliation:
Delft University of Technology, Faculty of Applied Sciences, Department of Biotechnology, Julianalaan 67, 2628 BC Delft, The Netherlands
J. Brucato
Affiliation:
INAF Osservatorio Astrofisico di Arcetri, L.go E. Fermi 5, 50125 Firenze, Italy
F. Grunthaner
Affiliation:
In Situ Exploration Technology Group, NASA Jet Propulsion Laboratory, Pasadena, CA, USA
P. Ehrenfreund
Affiliation:
Leiden Institute of Chemistry, Einsteinweg 55, 2333 CC, Leiden, The Netherlands Space Policy Institute, Elliott School of International Affairs, Washington DC, USA
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Abstract

Life on Earth is one of the outcomes of the formation and evolution of our solar system and has adapted to every explored environment on planet Earth. Recent discoveries have shown that life can exist in extreme environments, such as hydrothermal vents, in deserts and in ice lakes in Antarctica. These findings challenge the definition of the ‘planetary habitable zone’. The objective of future international planetary exploration programmes is to implement a long-term plan for the robotic and human exploration of solar system bodies. Mars has been a central object of interest in the context of extraterrestrial life. The search for extinct or extant life on Mars is one of the main goals of space missions to the Red Planet during the next decade. In this paper we describe the investigation of the physical and chemical properties of Mars soil analogues collected in arid deserts. We measure the pH, redox potential and ion concentrations, as well as carbon and amino acid abundances of soils collected from the Atacama desert (Chile and Peru) and the Salten Skov sediment from Denmark. The samples show large differences in their measured properties, even when taken only several meters apart. A desert sample and the Salten Skov sediment were exposed to a simulated Mars environment to test the stability of amino acids in the soils. The presented laboratory and field studies provide limits to exobiological models, evidence on the effects of subsurface mineral matrices, support current and planned space missions and address planetary protection issues.

Keywords

habitabilityMars soil analoguesplanetary organics
Type
Research Article
Information
International Journal of Astrobiology , Volume 8 , Issue 4 , October 2009 , pp. 301 - 315
Copyright
Copyright © Cambridge University Press 2009

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