The Galileo spacecraft dropped one probe into Jupiter’s atmosphere in 1995; after an hour, it was never heard from again. In 2016, NASA’s Juno spacecraft will become the second spacecraft to orbit Jupiter after Galileo, to see whether it has a rocky core. Saturn, too, has only been explored by flyby missions and one orbiter. The data those spacecraft send back is not quite as detailed as flying through their skies and tracking their crazy weather patterns. For that, NASA scientists are designing ‘windbots’.