NASA Spacecraft Is Set To Get A Close Look At Jupiter's Moon On Monday, the visit by NASA's Juno spacecraft will make the first close fly-by of Jupiter's moon Ganymede in more than 20 years. What are scientists hoping to learn?

NASA Spacecraft Is Set To Get A Close Look At Jupiter's Moon

On Monday, the visit by NASA's Juno spacecraft will make the first close fly-by of Jupiter's moon Ganymede in more than 20 years. What are scientists hoping to learn?