Jupiter

Jupiter

Jupiter symbol

Jupiter is the largest planet in the Solar System and the fifth planet from the Sun. It is a gas giant with a mass more than two and a half times that of all the other planets in the Solar System combined. Jupiter is primarily composed of hydrogen with a quarter of its mass being helium, though it may also have a rocky core of heavier elements.

Physical Characteristics

Size comparison of Jupiter and Earth

Jupiter has a diameter of about 142,984 km (88,846 mi) at its equator. It is known for its prominent bands of clouds and the Great Red Spot, a giant storm that has been observed for over 350 years. The planet's atmosphere is divided into several bands at different latitudes, resulting in turbulence and storms along their interacting boundaries.

Atmosphere

The atmosphere of Jupiter is composed mainly of hydrogen and helium, with trace amounts of methane, water vapor, ammonia, and other compounds. The upper atmosphere is characterized by cloud layers of ammonia crystals, while deeper layers contain clouds of ammonium hydrosulfide and water.

Magnetosphere

Jupiter has a powerful magnetosphere that extends up to 7 million kilometers in the direction of the Sun and almost to the orbit of Saturn in the opposite direction. This magnetosphere is the largest structure in the Solar System and is responsible for intense radiation belts and auroras at the planet's poles.

Moons

Diagram of Jupiter's structure

Jupiter has at least 79 known moons, including the four large Galilean moons: Io, Europa, Ganymede, and Callisto. These moons are some of the largest objects in the Solar System outside the Sun and the eight planets.

Galilean Moons

• Io is the most geologically active body in the Solar System, with hundreds of volcanoes and extensive lava flows.
• Europa is believed to have a subsurface ocean beneath its icy crust, making it a prime candidate for the search for extraterrestrial life.
• Ganymede is the largest moon in the Solar System and is larger than the planet Mercury.
• Callisto is heavily cratered and ancient, with a surface that has not been significantly altered by geological processes.

Exploration

Voyager 1 images of Jupiter

Jupiter has been visited by several spacecraft, including Pioneer 10, Pioneer 11, Voyager 1, Voyager 2, Galileo, and the Juno mission, which is currently studying the planet's atmosphere and magnetic field.

Cultural Significance

Jupiter has been known since ancient times and is named after the Roman king of the gods. It has been observed by many cultures and has played a significant role in mythology and astrology.

Related Pages

• Solar System
• Gas giant
• Galilean moons
• Great Red Spot
• Juno (spacecraft)