Jupiter's Moon Io Might Have a Hellish Magma Ocean Beneath Its Surface

Jupiter's Moon Io Might Have a Hellish Magma Ocean Beneath Its Surface

There are more than 200 moons in the solar system, but none quite like Io, the third largest of Jupiter’s 80 moons. Io is really, really volcanic. In fact, it’s peppered with so many hundreds of powerful active volcanoes that there must be something unusual beneath its crust. That something could be a thick moonwide layer of molten rock—or a “subsurface magma ocean,” according to a new study published in the Planetary Science Journal on Nov. 16 from Yoshinori Miyazaki …