Juno spacecraft. Computer artwork showing NASA's Juno spacecraft firing its Leros-1b main engine (centre left). Juno was launched from Cape Canaveral, USA on 5th August 2011, for a five-year flight to Jupiter. Unlike previous Jupiter missions, it will use solar panels (three arrays seen here). Previous Jupiter missions were powered by generators fuelled by radioactive decay of nuclear isotopes. 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.