Jupiter is the fifth planet from the Sun and the largest in the Solar System. It is a gas giant with a mass one-thousandth that of the Sun but is two and a half times the mass of all the other planets in the Solar System combined. Jupiter is primarily composed of hydrogen and helium.
Jupiter has a prominent system of bands and zones, which are caused by strong east-west winds in the planet's upper atmosphere. It also has a Great Red Spot, a massive storm that has been observed for over 300 years.
Jupiter has 79 known moons, including the four large Galilean moons: Io, Europa, Ganymede, and Callisto. These moons are some of the most interesting objects in the Solar System, with potential for hosting extraterrestrial life.