A closer look at water-related geologic activity on Mars

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Water has supposedly marked the surface of Mars and produced characteristic landforms. To understand the history of water on Mars, we take a close look at key locations with the High-Resolution Imaging Science Experiment on board the Mars Reconnaissance Orbiter, reaching fine spatial scales of 25 to 32 centimeters per pixel. Boulders ranging up to ∼2 meters in diameter are ubiquitous in the middle to high latitudes, which include deposits previously interpreted as finegrained ocean sediments or dusty snow. Bright gully deposits identify six locations with very recent activity, but these lie on steep (20° to 35°) slopes where dry mass wasting could occur. Thus, we cannot confirm the reality of ancient oceans or water in active gullies but do see evidence of fluvial modification of geologically recent mid-latitude gullies and equatorial impact craters.

Publication type Article
Publication Subtype Journal Article
Title A closer look at water-related geologic activity on Mars
Series title Science
DOI 10.1126/science.1143987
Volume 317
Issue 5845
Year Published 2007
Language English
Publisher American Association for the Advancement of Science (AAAS)
Contributing office(s) Astrogeology Science Center
Description 4 p.
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Science
First page 1706
Last page 1709
Other Geospatial Mars
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