The largest planet in the Milky Way is Jupiter. It has a diameter of about 86,881 miles (139,822 kilometers) and is more than 1,300 times the volume of Earth, making it a gas giant primarily composed of hydrogen and helium. Jupiter is known for its striking and colorful cloud bands, strong magnetic field, and the Great Red Spot—a massive storm larger than Earth that has been raging for centuries. Additionally, it has a system of moons, with Ganymede being the largest, further showcasing its dynamic and complex nature in our solar system.