 In 2000 , the Cassini probe , en route to Saturn , flew by Jupiter and provided some of the highest @-@ resolution images ever taken of the planet . It made its closest approach on December 30 , 2000 , and made many scientific measurements . About 26 @,@ 000 images of Jupiter were taken during the months @-@ long flyby . It produced the most detailed global color portrait of Jupiter yet , in which the smallest visible features are approximately 60 km ( 37 mi ) across . 
