Exo-Astrobiological Aspects of Europa and Titan: From Observations to Speculations

  title={Exo-Astrobiological Aspects of Europa and Titan: From Observations to Speculations},
  author={F. Raulin},
  journal={Space Science Reviews},
  • F. Raulin
  • Published 2005
  • Environmental Science
  • Space Science Reviews
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… Expand
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On the origin of Titan's atmosphere.
  • T. Owen
  • Chemistry, Medicine
  • Planetary and space science
  • 2000
Titan's atmospheric methane appears to have been formed from carbon and other carbon compounds, either by gas phase reactions in the subnebula or by accretional heating during the formation of Titan. Expand
Europa: Prospects for an ocean and exobiological implications
As far as we know, Earth is the only planet in our solar system that supports life. It is natural, therefore, that our understanding of life as a planetary phenomenon is based upon Earth-likeExpand
Organic Chemistry and Exobiology on Titan
Exobiology is not only the study of the origin, distribution and evolution of life in the universe, but also of structures — including at the molecular level, and processes — including organicExpand
On the habitability of Europa
Abstract It has recently been suggested that tidal and radiogenic heating of Europa has led to formation and maintenance of a liquid water ocean overlain by a thin ice crust ( S. W. Squyres, R. T.Expand
Exobiological Implications of a Possible Ammonia–Water Ocean inside Titan
Models of Titan's thermal history indicate that an ocean consisting of an ammonia-water solution, as much as 200 km deep, is presently concealed beneath a crust of water ice. Conditions within thisExpand
Europa's Crust and Ocean: Origin, Composition, and the Prospects for Life
Abstract We have considered a wide array of scenarios for Europa's chemical evolution in an attempt to explain the presence of ice and hydrated materials on its surface and to understand the physicalExpand
Possible Degree of Evolution of Solar-System Microorganisms
The present work is concerned with the search for life in the outer Solar System. We devote our attention to the determination of the likely degree of evolution of such biota (Chela-Flores, 1996;Expand
Oxirane: An Exotic Oxygenated Organic Compound on Titan?
After the discovery of CO, CO2, and more recently H2O in Titan's atmosphere, the chemistry of oxygenated organic compounds in this environment has been limited to theoretical studies only. BothExpand
The low temperature organic chemistry of Titan's geofluid.
One consequence of the low temperatures of Titan is the possible formation of organics unstable at room temperature and very reactive, which may be detectable on future IR spectra (ISO and Cassini) of Titan. Expand
On the internal structure and dynamics of Titan
Abstract The purpose of this paper is to study the evolution of Titan from the primordial core overturn to the present, and to investigate the possible existence of both a deep liquid layer and anExpand