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Valles Marineris, from U.S. Geological Survey Mars Digital Image Mosaic, reproduced at a scale of 230 meters/pixel. Click on image for full size version (82K GIF) Image from: Malin Space Science Systems

This image shows the steep slopes of Valles Marineris at higher resolution. Very high resolution images returned by the Mars Global Surveyor spacecraft allow closer examination of this unusual canyon. These images show slopes descending steeply to the north and south

Valles Marineris, from U.S. Geological Survey Mars Digital Image Mosaic, reproduced at a scale of 230 meters/pixel. Click on image for full size version (82K GIF) Image from: Malin Space Science Systems

This image shows the steep slopes of Valles Marineris at higher resolution. Very high resolution images returned by the Mars Global Surveyor spacecraft allow closer examination of this unusual canyon. These images show slopes descending steeply to the north and south

Valles Marineris, from U.S. Geological Survey Mars Digital Image Mosaic, reproduced at a scale of 230 meters/pixel. Click on image for full size version (82K GIF) Image from: Malin Space Science Systems

This image shows the steep slopes of Valles Marineris at higher resolution. Very high resolution images returned by the Mars Global Surveyor spacecraft allow closer examination of this unusual canyon. These images show slopes descending steeply to the north and south