The Year in Pictures -- 2006
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before and after view of gully on Mars Signs of Flowing Water on Mars
Bright new deposits seen in gullies on Mars suggest liquid water carried sediment in the past seven years. Liquid water is considered necessary for life, so these fingings heighten intrigue about possible microbial life on Mars.

At left, a before-and-after view from Mars Global Surveyor showing one of the gullies.

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  Jet Propulsion Laboratory
   California Institute of Technology