Friday, February 16, 2007


A Mars-orbiting spacecraft has spotted a subterranean natural plumbing system that might have ferried water beneath the surface of the red planet in the distant past.

New images taken by the HiRISE camera on NASA’s Mars Reconnaissance Orbiter (MRO) show hills and plateaus with alternating layers of dark and light colored rocks in Candor Chasma, one of several canyons that make up Valles Marineris, a sprawling Martian rift valley that is longer than the contiguous United States and up to seven times deeper than the Grand Canyon in places.


The timing of the flow remains uncertain, and could have occurred many millions or even billions of years ago.

Researchers suggest that liquid flowing through the fractures deposited iron-rich or clay-like minerals in the rock. The minerals would act like cement to strengthen the layers of rock and also bleach it a lighter color. Over millions of years, wind stripped away the top layers of surface rock, exposing the subsurface and its plumbing system to the light of day.

posted by Shaun A. Saunders


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