Credit & Copyright: NASA,Viking Project,USGSExplanation: The Mariner Valley, also known as the Valles Marineris canyon system, appears in this mosaic of images from NASA's Viking spacecraft as a huge gouge across the red planet. This "Grand Canyon" of Mars is about 2500 miles long and up to 4 miles deep. By comparison, the Earth's Grand Canyon is less than 500 miles long and 1 mile deep.
For more information about Mars see Calvin J. Hamilton's Mars Page.
The exploration of Mars is chronicled by the Center For Mars Exploration.
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NASA Official: Jay Norris. Specific rights apply.
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& Michigan Tech. U.
Based on Astronomy Picture Of the Day
Publications with keywords: canyon - Mars
Publications with words: canyon - Mars