The largest planet in our solar system is Jupiter. It has a diameter of approximately 86,881 miles (139,822 kilometers) and is over 11 times larger than Earth. Jupiter is a gas giant with no solid surface, and it is predominantly made up of hydrogen and helium gases. It is known for its striking features, such as the Great Red Spot, a massive storm that has been observed for over 300 years. Jupiter also has a unique system of rings, although they are not as prominent as those of Saturn.