Titlebook: Astrobiology; The Quest for the Co Gerda Horneck,Christa Baumstark-Khan Book 2002 Springer-Verlag Berlin Heidelberg 2002 Habitat.astrobiolo

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https://doi.org/10.1007/978-3-658-13817-2ion years (Ga) ago. These impactors would on the one hand have been delivering the volatiles as precursors of life, on the other hand, if sufficiently large and fast, would have eroded the atmosphere and perhaps sterilized the Earth and/or Mars, if life existed there [4, 5].

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Habitable Zones in Extrasolar Planetary Systemsrate planetary surface temperatures suitable for the development and subsistence of carbon-based life. The latter precondition is usually taken as the requirement that liquid water is permanently available at the planet’s surface. The HZ concept was introduced by Huang [1, 2] and extended by Dole [3] and Shklovskii and Sagan [4].

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Viable Transfer of Microorganisms in the Solar System and Beyondion years (Ga) ago. These impactors would on the one hand have been delivering the volatiles as precursors of life, on the other hand, if sufficiently large and fast, would have eroded the atmosphere and perhaps sterilized the Earth and/or Mars, if life existed there [4, 5].

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Hyperthermophilic Microorganismssumed to having been much hotter at that time than today [3]. Recently, fossil-remains of thread-like microorganisms have been discovered in a 3.2 billion year old deep sea volcanogenic hydrothermal deposit, indicating the existence ofhyperthermophiles already at Early Archaean times [4].

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