Mosaic of Valles Marineris from the Viking Orbiter 1, reproduced at a scale of 80 meters/pixel.
Click on image for full size
Image from: Malin Space Science Systems
Steep slopes of Valles Marineris
Better images returned by the Mars Global Surveyor spacecraft allow a closer look of this unusual canyon. As shown here, slopes seem to descend steeply to the north and south
debris-filled gullies with intervening rocky spurs, just like canyons on Earth.
These images indicate that there may have been a complicated and active early
history for geologic processes on Mars.
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