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Crescent Phobos setting behind Mars' limb A series of six frames captured by Rosetta as it receded from Mars, watching Phobos disappear behind Mars' limb. The atmosphere is lit with scattered sunlight, a line of Martian sunsets. ESA / MPS / UPD / LAM / IAA / RSSD / INTA / UPM / DASP / IDA / processed by Emily Lakdawalla