NASA Spacecraft Swoops So Close to Io That It Can See Volcanic Eruptions
Briefly

NASA's Juno probe captured a spectacular image of Jupiter's moon Io with twin eruptions on its surface, highlighting its status as the most volcanically active place in our Solar System. The image, taken from around 2,400 miles away, shows gaseous-looking trails on the moon's horizon, indicating the eruptions. NASA believes they are emitted either by two vents from one giant volcano or two volcanoes near each other.
The twin flybys are designed to provide new insight into how Io's volcanic engine works and whether a global magma ocean exists under Io's rocky surface.
Io, larger than Earth's moon, is filled with hundreds of erupting volcanoes and lakes of lava. Juno has collected data suggesting the existence of a gigantic ocean of magma beneath Io's surface, and further observations from its current trip may provide further confirmation.
There's compelling evidence from data gathered by Juno that a gigantic ocean of magma exists under Io's surface.
Read at Futurism
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