Neptune holds the record for the fastest winds ever measured on a planet. In its turbulent atmosphere, winds blow at supersonic speeds reaching 2,100 km/h, nearly six times the speed of the strongest winds ever recorded on Earth. These raging winds circulate mainly from east to west, opposite the planet's rotation, and sweep across the icy surface of the blue giant with incredible force. The origin of this phenomenal energy, despite Neptune receiving so little sunlight, remains partly mysterious to scientists.
Like Jupiter with its Great Red Spot, Neptune has its own giant storm systems, the most famous being the Great Dark Spots. First observed by Voyager 2 in 1989, these anticyclones are high-pressure areas as vast as Earth. Unlike Jovian storms, those on Neptune are ephemeral: they appear, migrate toward the equator at hundreds of meters per second, and disappear after a few years, only to be replaced by new ones. In 2018, Hubble spotted a new Great Dark Spot in the northern hemisphere, accompanied by bright, filamentous clouds similar to terrestrial cirrus.
Neptune's magnetic field is one of the strangest in the solar system. Highly tilted (47 degrees relative to the rotational axis) and significantly off-center, it is not aligned with the planet's core. This bizarre configuration, similar to that of Uranus, causes intense variations in the magnetic field's strength at the surface and creates scattered polar auroras, very different from the circular auroras of Earth or Jupiter. Scientists believe this magnetic field is generated by an ocean of water and liquid ammonia under high pressure in the mantle, rather than by a solid core as on other planets.
Neptune, though distant, remains a planet of surprising activity. Its deep blue color, due to atmospheric methane, contrasts with the violence of the phenomena that animate it. Learn more.
N.B.: The official definition of a planet (since 2006) requires it to orbit the Sun, to have a spherical shape due to its own gravity, and to have "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