'To send a spacecraft there is a little bit insane,' says Scott Bolton when talking about Jupiter, the largest planet in the solar system. But that is exactly what he has done, because Scott is head of Juno, the Nasa mission designed to peer through Jupiter's swirling clouds and reveal the wonders within.

How an envelope of gas can create some of the most wondrous sights in the solar system.

Brian Cox shows how a planet's size can make the difference between life and death.