What's that dark spot on Jupiter? It's the shadow of Jupiter's most volcanic moon Io.
What's that dark spot on Jupiter? It's the shadow of Jupiter's most volcanic moon Io. Since Jupiter shines predominantly by reflected sunlight, anything that blocks that light leaves a shadow. If you could somehow be in that shadow, you would see a total eclipse of the Sun by Io.
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Image Credit & License: NASA/JPL-Caltech/SwRI/MSSS; Processing: Kevin M. Gill
