A fresh animation unveils a vast expanse of molten rock atop Jupiter's moon Io.
A detailed perspective emerges from NASA's Juno spacecraft, which passed within 930 miles (1,500 kilometers) of Io's volcanic terrain in December 2023 and January 2024. These close encounters marked the most intimate observation ever of Jupiter's innermost major satellite. Io boasts hundreds of active volcanoes, with eruptions occasionally visible through Earth-based telescopes, according to NASA.
The latest imagery showcases Loki Patera, a 127-mile-long (200 km) lava reservoir on Io's crust. Scientists have monitored this fiery pool for decades, situated above subterranean magma chambers. Scott Bolton, lead investigator for the Juno mission, revealed during a recent press briefing at the European Geophysical Union General Assembly in Vienna that the cooling lava at the lake's core, encircled by potentially molten magma, reflects light in a manner akin to glass-like smoothness, reminiscent of the volcanic obsidian on Earth.
Within the lava lake's confines, jagged rocky outcrops dot the landscape. Bolton remarked, "Incredible intricacies are revealed, with these peculiar formations nestled amidst what could be a magma-filled basin bordered by searing lava."
Juno's instruments have determined Io's surface to be notably smoother than those of Jupiter's other three Galilean moons (Europa, Ganymede, and Callisto). Slightly larger than Earth's moon, Io's non-molten regions are predominantly cloaked in yellow sulfur and sulfur dioxide.
As Juno continues its trajectory around Jupiter, it gathers vital information about the gas giant's spectacular polar cyclones, each spanning the width of the continental U.S. Moreover, the mission monitors oxygen and hydrogen levels within Jupiter's atmosphere. The spacecraft is slated to complete its 61st flyby of Jupiter on May 12th.
