Nasa's Mars Reconnaissance Orbiter has provided evidence that water once flowed though a canyon on Mars in the Martian rift valley. In these layered deposits are lines called Halo's which scientists believe are clear and obvious signs of the presence of fluid in the past. While this is happening NASA's Opportunity rover is exploring similar areas near the Victoria Crater. Scientists believe that these deposits exposed by the crater are similar to those that Reconnaissance Orbiter found.
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