Jupiter

Jupiter is the fifth planet from the Sun and the largest in our Solar System, a gas giant composed primarily of hydrogen and helium. Discovered since ancient times and named for the Roman king of gods, Jupiter has captivated astronomers and philosophers for millennia.

This colossal world spans 11 times Earth's diameter and contains more mass than all other planets combined. Its most striking feature is the Great Red Spot, a storm larger than Earth that has raged for at least 350 years. Jupiter's rapid rotation—completing one day in just 10 hours—creates its distinctive cloud bands and powerful electrical phenomena.

The planet hosts at least 95 moons, including the four massive Galilean moons discovered by Galileo in 1610: Io, Europa, Ganymede, and Callisto. Europa, in particular, harbors a subsurface ocean beneath its icy crust, raising profound questions about potential biochemistry beyond Earth and habitability in extreme environments.

Jupiter's powerful Magnetic field and intense radiation belts make it inhospitable for conventional spacecraft, yet its gravitational influence has proven invaluable for space missions seeking trajectory boosts. The planet continues to yield scientific mysteries through large-scale observation programs and probe missions.

Related

Saturn, Exoplanet, Magnetic field, Great Red Spot, Europa (moon), Space exploration