Since 2006 there have been images sent back from an orbiter circling Mars that show water trenches that look a lot like fingers running through sand. These images could provide the first proof that there is running water on the planet Mars. Before this, only ice has been proven to be on Mars at both of its' poles. Since all known forms of life require water, this could lead to the finding of primitive life forms. Aliens as you humans like to call them...
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