NASA's Juno probe captures stunning views of Jupiter's volcanic moon Io (video)

Jupiter's four largest moons aren't just blurry specks in Galileo's telescope anymore.

Italian astronomer Galileo Galilei Discover Ganymede, Callisto, Europe Io and Io date back to 1610, which explains why they are called Galilean moons. We've learned a lot about these strange objects over the past 400 years thanks to ever-improving telescope views and close-up images taken by spacecraft like NASA's. Juno Orbital Jupiter.

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