How things change...
As the most geologically active body in the solar system massive geological changes can be observed on Io over a relatively short period.
In less than a decade the already massive feature near the south pole grew and darkened significantly.
By NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute - http://photojournal.jpl.nasa.gov/catalog/PIA09355 (image link), Public Domain, Link
I noticed the lo surface changes from 1999-2007. It’s obvious.
Thanks dear @gavvet for exploring our galaxy 🌌 and bringing the activities to us here!
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What causes this? It dosent look like a very atmospheric planet so I'm guessing not wind haha
volcanism