This picture was taken from the Mars Express and it is of Phobos, the innermost moon of Mars. Phobos is an extremely dark color, the darkest moon in the solar system in fact. Many believe that Phobos was a captured asteroid due to its composition of ice and dark rock and due to its irregular shape. It is also heavily cratered as it has most likely endured many collisions over time. Phobos orbits very close to Mars and will likely break up and crash into the Martian Surface.
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