NASA's Juno spacecraft prepares for Jupiter moon Io close flyby
NASA's Juno spacecraft is preparing for a close flyby of Jupiter's moon Io, which scientists hope will lend insight into the structure of the volcanically active moon. Juno is expected to pass within about 930 miles of Io's surface on Saturday. During the flyby, Juno will use three instruments to examine the moon. "The pass is expected to allow Juno instruments to generate a fire