Juno spacecraft at Jupiter, artwork. This NASA spacecraft is scheduled for launch in August 2011, for a five-year flight to Jupiter. Unlike previous Jupiter missions, this one will use solar panels (three arrays seen here). Previous Jupiter missions were powered by generators fuelled by radioactive decay of nuclear isotopes. The device at the end of the array at upper left is the magnetometer experiment. After arriving in July 2016, Juno will orbit the planet 32 times over the next year, gathering information about Jupiter's atmosphere, magnetic field and gravitational field. Jupiter, with a diameter of 142,984 kilometres, is the largest of the planets.