| Literature DB >> 19574383 |
P H Smith1, L K Tamppari, R E Arvidson, D Bass, D Blaney, W V Boynton, A Carswell, D C Catling, B C Clark, T Duck, E Dejong, D Fisher, W Goetz, H P Gunnlaugsson, M H Hecht, V Hipkin, J Hoffman, S F Hviid, H U Keller, S P Kounaves, C F Lange, M T Lemmon, M B Madsen, W J Markiewicz, J Marshall, C P McKay, M T Mellon, D W Ming, R V Morris, W T Pike, N Renno, U Staufer, C Stoker, P Taylor, J A Whiteway, A P Zent.
Abstract
The Phoenix mission investigated patterned ground and weather in the northern arctic region of Mars for 5 months starting 25 May 2008 (solar longitude between 76.5 degrees and 148 degrees ). A shallow ice table was uncovered by the robotic arm in the center and edge of a nearby polygon at depths of 5 to 18 centimeters. In late summer, snowfall and frost blanketed the surface at night; H(2)O ice and vapor constantly interacted with the soil. The soil was alkaline (pH = 7.7) and contained CaCO(3), aqueous minerals, and salts up to several weight percent in the indurated surface soil. Their formation likely required the presence of water.Entities:
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Year: 2009 PMID： 19574383 DOI： 10.1126/science.1172339
Source DB: PubMed Journal: Science ISSN： 0036-8075 Impact factor: 47.728