Saturn's rings are undoubtedly the most iconic feature of the solar system. While all giant planets have rings, Saturn's are by far the brightest and most extensive. Spanning nearly 300,000 kilometers in diameter, they are incredibly thin: their thickness does not exceed 10 to 15 meters in places. Composed of 99% pure water ice, with a hint of dust and rocks, these billions of particles range from the size of a grain of sand to that of a bus. Their origin remains debated: they could be the remnants of an icy moon torn apart by tidal forces or remnants of the formation of the solar system.
Saturn is the only planet in the solar system that would float if placed in a cosmic ocean large enough. Its average density is only 0.687 g/cm³, about 30% lower than that of water. This unique characteristic is explained by its composition: Saturn is a gas giant made primarily of hydrogen and helium, compressed by gravity. Although its core is rocky and dense, the immense atmosphere surrounding it is so light that it lowers the overall density of the planet below that of liquid water.
At Saturn's North Pole lies one of the strangest formations ever observed in the solar system: a giant jet stream in the shape of a perfect hexagon. Discovered by the Voyager probes in the 1980s and studied in detail by Cassini, this structure measures about 30,000 kilometers in diameter, large enough to contain four Earth-sized planets. Each side of the hexagon is longer than the diameter of our planet. Scientists believe that this stable geometric shape is created by a difference in speed between the polar winds and the surrounding atmospheric currents, a phenomenon replicated in laboratories with rotating cylinders but never observed elsewhere in nature on such a scale.
Saturn, with its retinue of 82 confirmed moons (including Titan, larger than Mercury), remains an inexhaustible source of wonder and scientific mysteries. Learn more.
N.B.: The official definition of a planet (since 2006) requires that it orbits the Sun, has a spherical shape due to its own gravity, and has "cleared" its orbit.
ETNO, Relics of the Primordial Chaos: In Pursuit of the Ghost of Planet Nine 
Phantom Super-Earths: The Lost Worlds of the Solar System 
Perihelion and Aphelion: The Apsides in the Solar System 
Winds of the solar system and giant planets
3D Simulator: Revolutions of the Planets
Mercury: The Planet with Two Faces
Venus: Earth's Infernal Twin
Earth, the Blue Planet: A Fragile Jewel in the Universe
Mars: The Conquests and First Human Steps on the Red Planet
Jupiter: A Failed Star at the Heart of Our System
Saturn: The Harmony of Orbital Resonances
Uranus: The Planet Tipped on the Horizon of the Solar System
Neptune: The Blue Giant of the Solar System
Roche limit
Remarkable characteristics of the planet Mercury
Remarkable characteristics of the planet Venus
Remarkable features of planet Earth
Remarkable characteristics of the planet Mars
Remarkable characteristics of the planet Jupiter
Remarkable characteristics of the planet Saturn
Remarkable characteristics of the planet Uranus
Remarkable characteristics of the planet Neptune
Characteristics of Planets: What Makes Them Unique
Venus, Veiled Planet: A Puzzle in our Solar System
Live on Mars
The seven wonders of the World
Planet 9 is still nowhere in sight
Axial Tilt of Planets: An Unstable Dance Through the Ages
Comparative sizes of planets and stars
The Journey of the Planets Along the Ecliptic: A Cosmic Choreography
Declination and right ascension
Saturn's Rings: A Ring System in Jeopardy