The Jovian planets include gas giants Jupiter and Saturn and ice giants Uranus and Neptune.
The gas giants are predominantly made of helium and hydrogen and the ice giants also contain rock, ice and a liquid mixture of water, water, methane and ammonia.
All four Jovian planets have multiple moons; sport ring systems have no solid surface and are immense.
The largest, Jovian, is also the largest planet in the solar system, Jupiter. Nearby is Saturn, the solar system's second largest planet.
