A chunk of ancient Mars
نویسندگان
چکیده
منابع مشابه
New perspectives on ancient Mars.
Mars was most active during its first billion years. The core, mantle, and crust formed within approximately 50 million years of solar system formation. A magnetic dynamo in a convecting fluid core magnetized the crust, and the global field shielded a more massive early atmosphere against solar wind stripping. The Tharsis province became a focus for volcanism, deformation, and outgassing of wat...
متن کاملAncient aqueous environments at Endeavour crater, Mars.
Opportunity has investigated in detail rocks on the rim of the Noachian age Endeavour crater, where orbital spectral reflectance signatures indicate the presence of Fe(+3)-rich smectites. The signatures are associated with fine-grained, layered rocks containing spherules of diagenetic or impact origin. The layered rocks are overlain by breccias, and both units are cut by calcium sulfate veins p...
متن کاملMagnetite biomineralization and ancient life on Mars.
Certain chemical and mineral features of the Martian meteorite ALH84001 were reported in 1996 to be probable evidence of ancient life on Mars. In spite of new observations and interpretations, the question of ancient life on Mars remains unresolved. Putative biogenic, nanometer magnetite has now become a leading focus in the debate.
متن کاملAncient Hydrothermal Springs in Arabia Terra , Mars
Introduction: Hydrothermal springs are important astrobiological sites for several reasons: 1) On Earth, molecular phylogeny suggests that many of the most primitive organisms are hyperthermophiles, implying that life on this planet may have arisen in hydrothermal settings [1-3]; 2) on Mars, similar settings would have supplied energyand nutrient-rich waters in which early martian life may have...
متن کاملThe Early Bombardment History of Mars Revealed in Ancient Megabasins
Minton, W. F. Bottke, H. V. Frey, R. J. Lillis, J. H. Roberts, S. T. Stewart Purdue University, Dept. of Earth & Atm. Sci., 550 Stadium Mall Dr., West Lafayette, IN 47907, [email protected], Southwest Research Institute and NASA Lunar Science Institute, 1050 Walnut St. Ste. 300, Boulder, CO 80302, Geodynamics Branch, Goddard Flight Center, Greenbelt, MD 20771, University of California, Berkel...
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ژورنال
عنوان ژورنال: Nature
سال: 2013
ISSN: 0028-0836,1476-4687
DOI: 10.1038/nature12836