Because Io is so close to its massive host planet, the moon is subjected to a tremendous gravitational pull as it orbits Jupiter once about every 42 hours, according to the Planetary Society.

A NASA spacecraft made its closest-ever approach to Jupiter's moon Io, coming within 930 miles of the "surface of the most volcanic world," and the space agency released new images of the flyby.

Jupiter, the largest planet in our solar system, is home to a fascinating array of moons. Among its 90-plus satellites, one stands out for its extraordinary geological activity: Io.

The mutilated surface of Jupiter’s moon Io was revealed in great detail by the Juno spacecraft, which has been exploring the Jovian system since 2016 and recently pulled off the closest flyby of ...

The technique has implications for future space missions, showing the potential for remote diagnostics and repair in deep ...

Io is the fifth most distant moon from Jupiter, orbiting at an average distance of 262,000 miles (422,000 kilometers), and the third-largest Jovian moon, at slightly larger than Earth's moon ...

Io is most volcanically active. This animation is an artist’s concept of Loki Patera, a lava lake on Jupiter’s moon Io, made using data from the JunoCam imager aboard NASA’s Juno spacecraft.

Jupiter’s moon Io is the best example of a world of fire, freckled with volcanoes and cracked by lava spills. There are many competing theories to explain the workings of this fire-orb.

The north polar region of Jupiter’s volcanic moon Io was captured by NASA’s Juno during the spacecraft’s 57th close pass of the gas giant on Dec. 30, 2023. Data from recent flybys is helping ...

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 ...

For centuries after Galileo discovered Io and 1610, NASA said a first of its kind solar powered spacecraft called Juno on a five-year 1.7 billion mile journey to Jupiter and its moons to see what ...