NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Valles Marineris on Mars. Three-dimensional computer image based on Mars Global Surveyor (MGS) data of part of the large Valles Marineris valley system on Mars. This is the largest known valley system in the solar system, stretching for over 5000 kilometres across the surface of Mars. It was caused by geological activity in Mars' past. Extensive erosion by wind and water has also contributed to its topography. This image is derived from measurements taken by the Mars Orbiter Laser Altimeter (MOLA) on the MGS spacecraft in orbit around Mars.
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