NASA’s Juno probe captures amazing views of Jupiter’s volcanic moon Io (video)

The four biggest moons of Jupiter aren’t just blurry smudges in Galileo’s telescope anymore.

The Italian astronomer Galileo Galilei discovered Ganymede, Callisto, Europa and Io back in 1610, which explains why they’re called the Galilean moons. We’ve learned a lot about these exotic bodies in the past 400 years thanks to ever-improving telescope views and close-up imagery snapped by voyaging spacecraft like NASA’s Juno Jupiter orbiter.

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