Recent flybys of the fiery world refute a leading theory of its inner structure—and reveal how little is understood about ...

S cott Bolton’s first encounter with Io took place in the summer of 1980, right after he graduated from college and started a job at NASA. The Voyager 1 spacecraft had flown past this moon of Jupiter, ...

Juno’s trajectory passes by Io every other orbit, flying over the same part of the moon each time. In December 2023, Juno ...

NASA's Juno mission has captured images of Jupiter's volcanic moon Io. The craft has now mapped all of the world's volcanoes, and will help scientists determine what lies under the lava surface.

On March 9, 1979, Linda Morabito discovered a volcanic plume on Io, a moon of Jupiter, in one of the photos from Voyager 1. She wrote, “I could feel tears begin to roll down my face at the sight ...

This image of Jupiter’s moon Europa was captured by the JunoCam instrument aboard NASA’s Juno spacecraft during the mission’s close flyby on September 29, 2022.

Juno will complete another close flyby of Io on February 3, 2024, which will allow scientists to compare changes on the surface of the hellish moon to see how the surface might be evolving over ...

Over the course of the next year and a half, the Juno spacecraft will carry out a total of nine flybys of Io. Two of the close encounters will take the probe to within 930 miles of the moon's surface.

Jupiter's moon Io is the solar system's most volcanic body thanks to a gravitational tug of war that rages below its surface. But now scientists know the violent moon has always been this way.

Jupiter’s moon Io may have been volcanically active throughout its life. In this image of Io, taken by NASA’s Juno spacecraft in 2023, a bright volcanic plume can be seen on the left, just ...

NASA's robotic Juno spacecraft is delivering the fresh data on Io with a series of flybys, each getting closer to Jupiter's volcanic moon until a pair of close-up encounters at a range of less ...

Assuming Io initially held some 20,000,000,000,000,000,000,000 (or 20 sextillion) tons of sulfur, the amount it’s lost so far leaves roughly 200 quintillion to 1.2 sextillion tons of sulfur ...