Two probes will be sent to study Jupiter and its four largest moons in the next big mission to the outer solar system, NASA announced today. The mission beat out a competing plan to send an orbiter, balloon and lander to Saturn's moon Titan. The multi-billion dollar mission, a joint endeavour of NASA and the European Space Agency, will launch two probes in 2020. The pair will reach Jupiter in 2026 and spend at least three years studying the system.
Ambitious plans to send probes to the outer planets are being considered by US and European space officials. One proposal envisages sending an orbiter to Saturn which would also drop a lander and a balloon on to the haze-shrouded moon Titan. The other sees two separate orbiters despatched to investigate Jupiter and its icy moons - Europa and Ganymede. Space agency officials will meet next week to decide which of the two plans should go forward for further study.