Astronomy Picture of the Day . A Newly Active Volcano On Jupiters Io . ... Credit: University of Arizona , JPL , NASA Explanation: Would a volcano plume discovered in January above Jupiter's Moon Io still be active months later? To answer this question, the robot spacecraft Galileo currently in orbit around Jupiter was maneuvered to image the plume site during its recent flyby of Io in August. ... The original plume , above the Tvashtar Catena volcanic area, was not even visible. ... January . ...