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Phobos over Mars from Phobos 2 The moon Phobos, 25 kilometers in diameter, is much darker than bright, dusty Mars, as seen in this image captured by the Phobos 2 spacecraft on March 25, 1989. Phobos 2 took a total of 13 color sets of images of Phobos before contact was lost on March 27, 1989. Russian Academy of Sciences / Ted Stryk