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Once every 15 years, the rings of planet Saturn are viewed edge-on as seen from Earth. When that happens, they almost seem to disappear. The rings are only about 1 km (0.6 mi) thick, but they extend to almost 500 000 km (311 000 mi) from the planet. Saturn’s largest moon Titan casts a shadow on the atmosphere.

CREDIT: NASA, ESA, and E. Karkoschka (University of Arizona).