Animated Juno spacecraft image of Jupiter. The planet's south pole is at bottom. Jupiter is the largest planet in the solar system. It has a diameter of around 140, 000 kilometres, more than ten times that of Earth. It is a gas giant and is mostly hydrogen and helium. Juno arrived at Jupiter in July 2016. Its mission is to orbit Jupiter over the following year, gathering information about the planet's atmosphere, magnetic field and gravitational field. Image taken by JunoCam at a distance of 46, 800 kilometres from Jupiter on 19th May 2017.