Although the surface of Saturn’s moon Titan is cold enough to freeze methane, it has sand dunes like those in the Arabian Desert, radar images taken by the Cassini spacecraft reveal. But instead of being made of ordinary sand, Titan’s dunes are probably grains of frozen organic compounds, water ice, or a mixture of both, Ralph Lorenz of the University of Arizona in Tucson and his colleagues report in the May 5 Science.
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