Ganymede, Jupiter’s largest moon, is bigger than the planet Mercury and is the only moon in the solar system with its own magnetosphere – a bubble-shaped region of charged particles surrounding the celestial body. On Monday, June 7th, NASA’s Juno spacecraft came within 645 miles (1038 kilometers) of the surface of Ganymede. The flyby was the closest a spacecraft has come to the solar system’s largest natural satellite since NASA’s Galileo spacecraft made its close approach back on May 20, 2000. Along with striking imagery, the solar-powered spacecraft’s flyby yielded insights into the moon’s composition, ionosphere, magnetosphere, and ice shell.