by NASA's Juno mission has been observing Jupiter and its moons since July 2016, and now Juno will come within 645 miles (1,038 kilometers) of Ganymede's surface.
t's the closest a spacecraft has been to the moon since the Galileo spacecraft made its approach in May 2000. At 3,270 miles across (5,262.4 kilometers), this giant moon is larger than the planet Mercury.
Source
t's the closest a spacecraft has been to the moon since the Galileo spacecraft made its approach in May 2000. At 3,270 miles across (5,262.4 kilometers), this giant moon is larger than the planet Mercury.
Source
