Half lit image of the Jupiter moon Io showing a soft beige surface with greenish surfaces mixed in. Sharp mountains stand out against the otherwise smooth surface and cast long shadows near the terminator line. Black lava features are scattered around on the surface, one of them has a horseshoe shape. The shadowed side of the moon is dimly lit by Jupiter and was slightly brightened during processing to show some faint surface features. Credit: NASA / JPL-Caltech / SwRI / MSSS / Simeon Schmauß
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