- Press Release
- Nov 26, 2022
Mars Odyssey THEMIS Image: Ares Vallis Polygons
|This jumble of eroded ridges and mesas occurs within Ares Vallis, one of|
the largest catastrophic outflow channels on the planet. Floods raged
through this channel, portions of which are up to 25 km wide, pouring
out into the Chryse Basin to the north. Close inspection of the THEMIS
image reveals polygonal shapes on the floor of the channel system.
Polygonal terrain on Mars is fairly common although the variety of forms
and scales of the polygons suggests multiple modes of origin. Those in
Ares Vallis resemble giant desiccation polygons that form in soils on
Earth when a moist layer at depth drys out. While polygons can form
in icy soils (permafrost) and even lava flows, their presence in a
channel thought to have been carved by flowing water is at least
consistent with a mode of origin that involved liquid water.
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[Source: ASU THEMIS Science Team]
NASA’s Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA’s Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.
Image Credit: NASA/JPL/Arizona State University
|Longitude||331.3E (28.7W)|| ||Resolution (m)||19|
|Image Size (pixels)||3025×1234|| ||Image Size (km)||57.5×23.4|