Publication Date:
2009-12-17
Description:
Since 2004, Saturn's moon Iapetus has been observed repeatedly with the Imaging Science Subsystem of the Cassini spacecraft. The images show numerous impact craters down to the resolution limit of approximately 10 meters per pixel. Small, bright craters within the dark hemisphere indicate a dark blanket thickness on the order of meters or less. Dark, equator-facing and bright, poleward-facing crater walls suggest temperature-driven water-ice sublimation as the process responsible for local albedo patterns. Imaging data also reveal a global color dichotomy, wherein both dark and bright materials on the leading side have a substantially redder color than the respective trailing-side materials. This global pattern indicates an exogenic origin for the redder leading-side parts and suggests that the global color dichotomy initiated the thermal formation of the global albedo dichotomy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Denk, Tilmann -- Neukum, Gerhard -- Roatsch, Thomas -- Porco, Carolyn C -- Burns, Joseph A -- Galuba, Gotz G -- Schmedemann, Nico -- Helfenstein, Paul -- Thomas, Peter C -- Wagner, Roland J -- West, Robert A -- New York, N.Y. -- Science. 2010 Jan 22;327(5964):435-9. doi: 10.1126/science.1177088. Epub 2009 Dec 10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institut fur Geologische Wissenschaften, Freie Universitat Berlin, 12249 Berlin, Germany. Tilmann.Denk@fu-berlin.de〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20007863" target="_blank"〉PubMed〈/a〉
Keywords:
Color
;
Extraterrestrial Environment
;
*Ice
;
*Saturn
;
Spacecraft
;
Temperature
;
*Water
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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