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  • 1
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    Climate evolution on the terrestrial planets (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The present comparative evaluation of the long-term evolution of the Venus, earth, and Mars climates suggests that the earth's climate has remained temperate over most of its history despite a secular solar luminosity increase in virtue of a negative-feedback cycle based on atmospheric CO2 levels and climate. The examination of planetary climate histories suggests that an earth-sized planet should be able to maintain liquid water on its surface at orbital distances in the 0.9-1.5 AU range, comparable to the orbit of Mars; this, in turn, implies that there may be many other habitable planets within the Galaxy.
    Keywords: ASTROPHYSICS
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    NASA TECHNICAL REPORTS
  • 2
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    Escape of atmospheres and loss of water (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The properties and limitations of several loss processes for atmospheric gases are presented and discussed. They include thermal loss (Jeans and hydrodynamic); nonthermal loss (all processes involve charged particles); and impact erosion, including thermal escape from a molten body heated by rapid accretion. Hydrodynamic escape, or 'blowoff', is of particular interest because it offers the prospect of processing large quantities of gas and enriching the remainder in heavy elements and isotopes. In a second part, the water budgets and likely evolutionary histories of Venus, Earth and Mars are assessed. Although it is tempting to associate the great D/H enrichment on Venus with loss of a large initial endowment, a steady state with juvenile water (perhaps from comets) is equally probable.
    Keywords: ASTROPHYSICS
    Format: text
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    NASA TECHNICAL REPORTS
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