A large majority of the missions have been '' flybys '' , in which detailed observations are taken without the probe landing or entering orbit ; the '' Galileo '' spacecraft is the only one to have orbited the planet .
A large majority of the missions have been '' flybys '' , in which detailed observations are taken without the probe landing or entering orbit ; such as in Pioneer and Voyager programs . 
 The Galileo spacecraft is the only one to have orbited the planet .