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[align=left]Where Did Water Flow on Mars?
Modeling Mars' surface in search of ancient rivers and oceans
By Witold Fraczek, ESRI Benchmarks
SummaryWas there ever life on Mars? Many would like to believe that we used to have relatives who lived nearby. The likelihood that life existed on Mars is higher than for any other planet in the solar system. Because all known forms of life require water, the evidence that water once flowed on Mars is essential to prove that life existed there. Conversely, the possibility of life cannot definitely be rejected unless it is conclusively demonstrated that there was never water in a liquid form on Mars[/align].

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[align=left]http://www.esri.com/news/arcuser/0408/mars.html[/align]المصدر
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