* Astronomy

This image, taken by the High Resolution Stereo Camera (HRSC) on board ESA’s Mars Express spacecraft, show the outlet channel of the Uzboi Vallis system into Crater Holden, in the region of Noachis Terra, centred at about 26º South and 325º East, on Mars.
The deepest parts of the valley floor are more than 1600 metres below the surrounding area. The numerous valleys at the flanks of Uzboi Vallis indicate that water probably played a major role in the formation and evolution of this region. Most of the valleys have been covered by younger sediments, indicating they have been inactive in recent geological time.
The terrain within Crater Holden is the result of a long and varied evolution. The numerous smaller craters inside Holden indicate that the crater is old.


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Many smaller craters on the floor of Holden are covered with sediments, which were deposited after the formation of these craters and indicate that they are older than the unfilled small craters.
The central mount of Holden is partly hidden, because it has also been covered by sediments. The rim of the crater has been cut by gullies, which sometimes form small valley networks.

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