KEES VEENENBOS / SCIENCE PHOTO LIBRARY KEES VEENENBOS / SCIENCE PHOTO LIBRARY
Eroded Martian landscape. Image 1 of 2. Computer artwork looking east along the Eos Chasma canyon on Mars. Water on Mars 3.5 billion years ago would have flowed through this canyon. However, the thin Martian atmosphere and weak gravity could not keep the water, and Mars became a desert. Eos Chasma is an eastern canyon of Valles Marineris (Mariner Valley), a massive crack in the Martian crust near the equator. The image is hundreds of kilometres wide and the walls of the canyon are several kilometres high. The topography was drawn with Terragen software, using data from the laser altimeter on the Mars Global Surveyor probe. For water in this area, see image R350/168.
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