Boreskov

OP‐41LOOKING FOR LIVE IN HIGH TEMPERATURE WORLDSKsanfomality L.Space Research Institute RAS, Moscow, RussiaLooking for habitable planets is based on notions of the Earth’ physics. The Earthpossesses a unique combination of physical properties needed for the evolution of aminonucleic‐acidform of life. Physical conditions that an Earth‐like planet should possess producevery narrow intervals of many physical parameters that are required for the existence of ourform of life. First of all, it is the temperature condition. A large number of discoveredexoplanets orbits their host stars at very low distances. Even if many other parameterswould be favorable or suitable for existence of life they differ in temperature conditions.One may accuse us of a certain Earth’s chauvinism, not admitting the existence of nonamino‐nucleic‐acidliving forms (despite having no proves for their existence). Strictlyspeaking, there is evidence that life would even adapt to the temperatures exceeding theones in the interval 273 < T < 340K and the hard radiation level. The known rhizobia use thehigh energy of pi‐bonds reaching 10 eV and more in their metabolism without damagingthemselves. If one considers such energies to be a result of equivalent temperaturesinfluence on the action on these bacteria, one may conclude they could exist at very hightemperatures. However, even if admitted that such metabolism is possible, the nucleic acidsmay not resist high temperatures. If high temperature life exists would its nature based oncarbon or not? One may suppose that at the high temperatures another reaction typessuitable for life could exist. Similar to conditions on some possible extrasolar Earth‐likeplanet is the ambient temperature on the surface of Venus, 740 K. This parallel is consideredin the paper. Strange black strikes can be seen amid stones on the first panoramastransmitted by the Venera‐9 and Venera‐10 landers from the Venus surface in October,1975. The strikes are of more or less regular shape and are very dark, even in comparisonwith the dark Venusian surface (albedo 4‐11%). May these strange strikes be living creatures,plants? Their details are blurred due to the picture’s low resolution. Once it allowed me toput a question, if plants could exist on Venus, in the dense, incandescent atmosphere(Ksanfomality, 1978). This question seems rather fantastic. Impotant for life is availability ofchemical sources of energy, for example chemical sources, as an oxidizing medium andoxidized materials. This is not the case for Venus‐like planets. However, the illuminance 5‐7klx at the Venusian surface (Ksanfomality, 1985) is enough for the photosynthesis. For aVenus‐like world, the photosynthesis is the most probable sources of energy for thesehypothetic creatures.References[1]. Ksanfomality L, (1985). Planeta Venera (The Planet Venus, in Russian), Nauka, Fizmatlit, Moscow.102