Jupiter’s moon Io is considered the most volcanically active world in our solar system.
When in 1979, the Voyager 1 spacecraft flew by Io, it observed nine active volcanoes splashing fine lava particles several hundred kilometers into space. Observations by the Galileo spacecraft came 20 years later, indicating as many as 300 volcanoes active at a given time. And now, thanks to the Juno Spacecraft’s super close flybys, we can have a very detailed view of Io’s giant lava lake called Loki Patera.
More info: NASA
