Exo-Astrobiological Aspects of Europa and Titan: From Observations to Speculations
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By extrapolating what we know on the origins of life on Earth, and in particular on the chemical processes which gave rise to the first living system, Europa and Titan appear as two major targets for studies of exo/astrobiology in the outer solar system. With the likely presence of water oceans relatively close to its surface, coupled to possible sources of organics, the emergence and sustaining of life on Europa seems possible. On Titan, it cannot be ruled out. But the main exobiological interest of the largest satellite of Saturn is the presence of a complex organic chemistry which shows many similarities with the prebiotic chemistry which allowed the emergence of life on Earth.
KeywordsEuropa Titan exobiology astrobiology organic chemistry prebiotic chemistry biological signatures life
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- Abbas, O., and Schulze-Makuch, D.: 2002, ‘Acetylene-based pathways for prebiotic evolution on Titan’, ESA SP-518, 345–348.Google Scholar
- Benner, S.: 2002, ‘Weird life: chances versus necessity’, Communication at ‘Weird Life’ planning session for NRC Committee on the origins and evolution of life, National Academies of Sciences, USA, http://www7.nationalacademies.org/ssb/weirdlife.html Bernard, J.-M., Coll, P., and Raulin, F.: 2002, ‘Variation of C/N and C/H ratios of Titan’s aerosols analogues’, Proc. 2d European Workshop on Exo-/Astro-Biology, ESA SP-518, 623–625.
- Brack, A. (ed.): 1998, The Molecular Origins of Life: Assembling Pieces of the Puzzle, Cambridge, New York, Sydney: Cambridge University Press.Google Scholar
- Chela-Flores, J.: 1998, ‘Possible degree of evolution of solar-system microorganisms’, in J. Chela- Flores and F. Raulin (eds.), Exobiology: Matter, Energy and Information in the Origin and Evolution of Life in the Universe, Kluwer Academic Publishers, pp. 229–234.Google Scholar
- Haldane, J.B.S.: 1929, The Origin of Life, Rationnalist Annual.Google Scholar
- Imanaka, H., Khare, B.N., Elsila, J.E., Bakes, E.L.O., McKay, C.P., Cruikshank, D.P., Sugita, S., Matsui, T., and Zare, R.N.: 2004, ‘Laboratory experiments of Titan tholin formed in cold plasma at various pressures: implications for nitrogen-containing polycyclic aromatic compounds in Titan haze’, Icarus 168, 344–366.CrossRefGoogle Scholar
- Kargel, J., Kaye, J., Head, J., Marion, G., Sassen, R., Crowley, J., Ballesteros, O., Grant, S. and Hogenboom, D. : 2000, ‘Europa’s crust and ocean: origin, composition and the prospect for life’, Icarus 148, 226–265.Google Scholar
- Lorenz, R: 2000, ‘Post-Cassini exploration of Titan: science rational and mission concepts’, J. British Interplan. Soc. 53, 218–234.Google Scholar
- Miller, S.L.: 1998, ‘The endogenous synthesis of organic compounds’, in A. Brack (ed.), The Molecular Origins of Life: Assembling Pieces of the Puzzle, pp. 59-85, Cambridge University Press, Cambridge, New York, Sydney, pp. 59–85.Google Scholar
- Miller, S.L. and Orgel, L.: 1974, The origins of life on the Earth, Prentice Hall, N. Jersey.Google Scholar
- Oparin, A.I.: 1938, The Origin of Life, Macmillan, New York.Google Scholar
- Oro, J., Squyres, S. W., Reynolds, R.T., and Mills, T.M.: 1992, ‘Europa: prospects for an ocean and exobiological implications’, in G. Carle, D. Schwartz, and J. Huntington (eds.), Exobiology in Solar System Exploration, NASA SP-512, 102–125.Google Scholar
- Raulin, F.: 1990, ‘Prebiotic syntheses of biologically interesting monomers in aqueous solutions: facts and constraints’, J. British Interplanet. Soc. 43, 39–45.Google Scholar
- Raulin, F. and Frére, C.: 1989, ‘Gas phase organic syntheses in planetary environments, and the case of Titan’, J. British Interplan. Soc. 42, 411–422.Google Scholar
- Schulze-Makuch, D. and Irwin, L.N.: 2004, Life in the Universe, Expectations and Constraints, Springer.Google Scholar
- Simakov, M.B.: 2001, ‘The possible sites for exobiological activities on Titan’, ESA SP-496, 211–214.Google Scholar
- Strobel, D.F.: 2005, ‘Photochemistry in outer solar system atmospheres’, Space Sci. Rev., this volume.Google Scholar