Using the phase diagram of liquid water to search for life

نویسندگان

  • E. G. Jones
  • E. G. JONES
  • C. H. LINEWEAVER
چکیده

This article may be used for research, teaching, and private study purposes. Any substantial or systematic reproduction, redistribution, reselling, loan, sub-licensing, systematic supply, or distribution in any form to anyone is expressly forbidden. The publisher does not give any warranty express or implied or make any representation that the contents will be complete or accurate or up to date. The accuracy of any instructions, formulae, and drug doses should be independently verified with primary sources. The publisher shall not be liable for any loss, actions, claims, proceedings, demand, or costs or damages whatsoever or howsoever caused arising directly or indirectly in connection with or arising out of the use of this material. The correlation between liquid water and life may be our most reliable tool in the search for extraterrestrial life. To help develop this tool, we explore the complex relationship between liquid water, partial pressure, and solute freezing point depression on Earth and Mars and discuss the conditions under which liquid water is metastable on Mars. We establish the physical conditions for the existence of saline aqueous solutions in the pores of the martian near surface substratum. We find that thin films of near subsurface liquid water on Mars at *–208C could provide a viable niche for terrestrial psychrophilic halophiles. Since some martian salts can suppress the freezing point of aqueous solutions with minimal suppression of the water activity, some martian liquid water environments with a water activity above *0.6 may also be able to support terrestrial life at temperatures as low as 7308C, *108C lower than the limit of terrestrial life.

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تاریخ انتشار 2012