#PPOD: Taken by NASA's Cassini spacecraft on September 12, 2007, this image of Saturn's outermost large moon Iapetus has been assembled from infrared, green, and ultraviolet-filtered images (IR1/GRN/UV3). The large craters Engelier and Gerin are near the top right. Credit: NASA/JPL-Caltech/SSI/CICLOPS/Kevin M. Gill
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