Loki Patera, Io
Filed under pretty pictures, Jupiter's moons, Io
The detailed structure near the volcano Loki is like nothing seen elsewhere on Io. When this Voyager 1 picture was taken, the main eruptive activity came from the lower left of the dark linear feature (perhaps a rift) in the center. Below is the "lava lake," a U-shaped dark area about 200 kilometers across.
NASA / JPL / UA
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Original image data dated on or about March 5, 1979