Mars: Waterworld or Dune?: Water and life elsewhere
نویسندگان
چکیده
منابع مشابه
Dune formation on the present Mars.
We apply a model for sand dunes to calculate formation of dunes on Mars under the present Martian atmospheric conditions. We find that different dune shapes as those imaged by Mars Global Surveyor could have been formed by the action of sand-moving winds occurring on today's Mars. Our calculations show, however, that Martian dunes could be only formed due to the higher efficiency of Martian win...
متن کاملGlassy Subaqueous Lavas as a Habitat for Life on Earth, Mars, and Elsewhere?
Introduction: Numerous studies over the past decade have demonstrated that microbial life rapidly colonizes terrestrial subaqueous volcanic glass [1-5]. Evidence for microbial alteration of terrestrial subaqueous volcanic rocks has been reported from modern ocean crust, ophiolites, and Archean greenstone belts [1-5]. Microbial alteration structures with characteristic granular and tubular morph...
متن کاملDune-Yardang Interactions in Becquerel Crater, Mars.
Isolated landscapes largely shaped by aeolian processes can occur on Earth, while the majority of Mars' recent history has been dominated by wind-driven activity. Resultantly, Martian landscapes often exhibit large-scale aeolian features, including yardang landforms carved from sedimentary-layered deposits. High-resolution orbital monitoring has revealed that persistent bedform activity is occu...
متن کاملThe Physics of Sand Dune Formation and Migration on Mars
Sand dunes have been observed throughout the surface of the planet Mars. Movement of these dunes has been theorized and inferred from the lack of craters on dunes. Dune movement has not yet been directly imaged, however. Understanding sand movement processes is vital to a correct Martian climate model, as well as the safety of future missions to Mars. Imagery from several Martian orbiters was a...
متن کاملBarchan dune asymmetry: Observations from Mars and Earth
0019-1035/$ see front matter 2009 Elsevier Inc. A doi:10.1016/j.icarus.2009.08.023 * Address: Planetary Science Institute, 1700 E. Ft. Lo USA. Fax: +1 520 795 3697. E-mail address: [email protected]. Barchan dune asymmetry refers to the extension of one barchan limb downwind. It is a common dune form on Earth and also occurs on Mars and Titan. A new classification of barchan limbs is presented wh...
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ژورنال
عنوان ژورنال: The Biochemist
سال: 2008
ISSN: 0954-982X,1740-1194
DOI: 10.1042/bio03004022