Support WBURHere's why Jupiter's tally of moons keeps going up and upPlay03:56Download AudioNell GreenfieldboyceFebruary 09, 2023 ShareThis composite was made with images from NASA's Juno mission and shows the shadow on Jupiter cast by Io, one of its many moons. (NASA/JPL-Caltech/SwRI/MSSS/Kevin M. Gill)