These composite views depicting volcanic activity on Io were generated using both visible light and infrared data collected by NASA's Juno spacecraft during flybys of the Jovian moon on Dec. 14 ...

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.

After making the closest Io flyby of any spacecraft in more than 20 years, NASA's Juno probe returned amazingly detailed imagery that will help scientists discover the source of the small moon's ...

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.

Flybys of Jupiter’s fiery moon Io, carried out by NASA’s Juno spacecraft, are helping to solve the enduring mystery of why the small moon is the most volcanically active body in our solar ...

A map of 266 hot spots on Io made using data from NASA's Juno probe, identified in data obtained from March 2017 to July 2022. The larger the symbol, the greater the 4.8 μm spectral radiance, a ...

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 ...

Behold the volcano-blanketed moon, Io. After swooping by Jupiter's tortured moon on Feb. 3, NASA 's Juno spacecraft beamed back some of the closest-ever images of this unique world.

Moon-quakes first measured by the Apollo astronauts have been attributed to these tides. The tides that Jupiter raises on Io, however are powerful enough to induce sufficient friction in that moon ...

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.