The massive Valles Marineris canyon has been revealed in stunning new images taken by the European Space Agency's Express. At 2,485 miles long, over 124 miles wide and more than 4 miles deep, the Red Planet's canyon makes America's seem downright puny by comparison - Valles Marineris would span the distance from the northern tip of Norway to the southern tip of Sicily.The new image depicts two trenches, or chasma, that form a portion of the western part of Valles Marineris. On the left is the 521-mile-long lus Chasma and on the right is the 500-mile-long Tithonium Chasma.
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