On December 1st 2010, this photo of the Martian moon Phobos was uploaded to the Astronomy Picture of the Day site. Phobos is the darkest moon in our solar system because it reflects such little light. Also, Phobos has an extremely abnormal orbit which is highly eccentric. This leads astronomers to believe that Phobos is actually a captured asteriod and not a moon particularly. It is composed of both and ice and dark rock and is said to be covered in about a meter of loose dust. It is a heavily cratered barren moon that was captured here by the Mars Express, a man made satellite currently orbiting Mars.
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