木星, or Jupiter, is the largest planet in our solar system. It is a gas giant, primarily composed of hydrogen and helium, and has a thick atmosphere with colorful bands and storms. One of its most famous features is the Great Red Spot, a massive storm that has been raging for centuries. Jupiter has a strong magnetic field and at least 79 known moons, including the four largest, known as the 伽利略卫星 (Galilean moons): 木卫一 (Io), 木卫二 (Europa), 木卫三 (Ganymede), and 木卫四 (Callisto). These moons vary in size and composition, with Europa believed to have a subsurface ocean that may harbor conditions suitable for life.