Signs of Flowing Water on Mars
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Before-and-after view of a gully on Mars New Gully Deposit
Before-and-after views where a gully flowed in a crater in the Centauri Montes Region. The left image shows the crater in 1999 when no light-toned deposit was present. The right image was taken in 2005. This fresh deposit is several hundred meters or yards long.

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  Jet Propulsion Laboratory
   California Institute of Technology