共查询到20条相似文献,搜索用时 13 毫秒
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Squyres SW Aharonson O Arvidson RE Bell JF Christensen PR Clark BC Crisp JA Farrand W Glotch T Golombek MP Grant J Grotzinger J Herkenhoff KE Johnson JR Jolliff BL Knoll AH McLennan SM McSween HY Moore JM Rice JW Tosca N 《Nature》2006,443(7107):E1-2; discussion E2
The Mars Exploration Rover Opportunity discovered sulphate-rich sedimentary rocks at Meridiani Planum on Mars, which are interpreted by McCollom and Hynek as altered volcanic rocks. However, their conclusions are derived from an incorrect representation of our depositional model, which is upheld by more recent Rover data. We contend that all the available data still support an aeolian and aqueous sedimentary origin for Meridiani bedrock. 相似文献
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Images returned by the spacecraft Clementine have been used to produce a quantitative illumination map of the north pole of the Moon, revealing the percentage of time that points on the surface are illuminated during the lunar day. We have used this map to identify areas that are constantly illuminated during a lunar day in summer and which may therefore be in permanent sunlight. All are located on the northern rim of Peary crater, close to the north pole. Permanently sunlit areas represent prime locations for lunar outpost sites as they have abundant solar energy, are relatively benign thermally (when compared with equatorial regions), and are close to permanently shadowed regions that may contain water ice. 相似文献
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Climate policy: Oil's tipping point has passed 总被引:1,自引:0,他引:1
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