By G. A. Soffen (auth.), George Marx (eds.)

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Extra resources for Bioastronomy — The Next Steps: Proceedings of the 99th Colloquium of the International Astronomical Union held in Balaton, Hungary, June 22-27, 1987

Sample text

By generalizing the situation of the Earth, we can summarize the necessary conditions for a planet on which life exists as follows: it has to have a mechanism to eliminate entropy from it; there must be: (1) Centred star as a heat source with an appropriate temperature and appropriate size at an appropriate distance, to make the "living" planet able to take in heat at a higher temperature and disperse it at a lower temperature into space. (2) An appropriate "fundamental substance" to embody the mechanism above.

Soderblom, R. Beebe, D. M. Boyce, A. A. H. A. F. K. N. E. E. E. Dowling, D. J. Hansen, C. E. P. V. J. Krauss, H. Masursky, D. Morrison, T. B. B. C. Porco, K. Rages, C. M. A. Sromovsky, C. G. E. P. J. Terrile, P. R. Thompson, and J. Veverka, Voyager 2 in the Uranian System: Imaging Science Results, Science 233, 43-64 (1986). 8. , Low temperature condensation from the solar nebula, Icarus 16, 241-252 (1972). 9. , Galilean satellites: Identification of water frost, Science 118, 1087-1089 (1972). 10.

Ct_ . loTI"":"'l.. ~ 1 aye 1 1:,',1'. ). '.. ". 9. Hubbard 1984). 07 9 cm-' which is as small as an urder below the density of the ocean on the Earth. At the same time, the giant-planet atmospheres must contain clouds of drop-liquid phase of water, possibly with admixtures of other aerosole. Therefore, the chemical processes there may proceed almost as intensively as in the Earth's oceans. :. nr"qe". ·:i:,1::j,UII of the 1<. hl:; intensively cit"culatlng planetary atmosphere may prove to be such sources.

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