On Two Ancient Conjunctions of Mars and Jupiter
نویسندگان
چکیده
منابع مشابه
The atmospheres of Mars, Venus and Jupiter.
The general properties of the atmospheres of Mars, Venus and Jupiter are reviewed. The evolutionary processes of planetary atmospheres are outlined as an introduction to a detailed discussion of the structure of the atmospheres of other planets. The most recent observational results indicate that the surface pressure on Mars could be as low as 20 mb, and the amount of CO2 may have a mixing rati...
متن کاملNew 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 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 کاملThe Structure and Evolution of Ancient Impact Basins on Mars
The number of Martian impact basins, once thought deficient owing to a low number of impactors, has been significantly increased through the identification of structural imprints that remain even after nearly complete erasure of basin massifs. Five ancient multiringed impact basins were selected for detailed study and exhibit a systematic pattern of rejuvenation of the multiring plan through en...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1874
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/34.5.247