File:PIA17079 Martian Features Formed When Material Moves Downslope.jpg

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English: As on the Earth, many processes can move material down a Martian slope. This graphic compares seven different types of features observed on Mars that appear to result from material flowing or sliding or rolling down slopes.

Processes that explain one type of downslope feature may be irrelevant to another type. Some processes depend on the presence of a fluid, some are driven by seasonal changes in the environment, and others occur randomly when gravity is able to pull down unstable slope material.

These different processes can generate a wide range of feature shapes, though sometimes different processes can yield similar-looking results. Thus, to figure out how a feature may have formed, more must be considered than its shape. For example, researchers examining images from Mars orbiters have found differences in

  1. the season when the features are formed or are active (e.g., the features called "recurring slope lineae" or RSLs appear during late spring and summer, but linear gullies are active only during early spring);
  2. the features' sizes (e.g., slope streaks can extend for miles or kilometers, but dark frost streaks on dunes extend only up to 100 yards, or meters); and
  3. the types of terrain on which a feature is found (e.g., gullies with an alcove-channel-apron shape are found both on rocky slopes and on sandy slopes, but linear gullies are only found on sandy slopes; dark frost streaks are formed on frozen dune slopes, but RSLs are formed on dark, warm slopes).

Scientists consider all of these factors -- and more -- when trying to form a complete picture about a feature's formation history and in figuring out what the presence of that feature means about the environment.

The seven images of different types of downslope features come from three different NASA Mars orbiters. The image of a landslide comes from the Thermal Emission Imaging System (THEMIS) on NASA's Mars Odyssey. The images of alcove-channel-apron gullies and of slope streaks come from the Mars Orbiter Camera (MOC) in NASA's Mars Global Surveyor. The other images come from the High Resolution Imaging Science Experiment (HiRISE) on NASA's Mars Reconnaissance Orbiter.

The University of Arizona, Tucson, operates THEMIS. Malin Space Science Systems, San Diego, operated MOC. The University of Arizona, Tucson, operates HiRISE. NASA's Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, has managed the Mars orbiter projects for NASA's Science Mission Directorate, Washington.

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Source Catalog page · Full-res (JPEG · TIFF)
Author NASA/JPL-Caltech/ASA/MSSS/UA
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This image or video was catalogued by Jet Propulsion Laboratory of the United States National Aeronautics and Space Administration (NASA) under Photo ID: PIA17079.

This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing.
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This media is a product of the
2001 Mars Odyssey mission
Credit and attribution belongs to the mission team, if not already specified in the "author" row
This media is a product of the
Mars Reconnaissance Orbiter mission
Credit and attribution belongs to the mission team, if not already specified in the "author" row
This media is a product of the
Mars Global Surveyor mission
Credit and attribution belongs to the mission team, if not already specified in the "author" row

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Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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