Neptune is the eighth and farthest known planet from the Sun in the Solar System. In the Solar System, it is the fourth-largest planet by diameter, the third-most-massive planet, and the densest giant planet.
Mass: 1.024 ×10^26 kg
Radius: 24,764 Km
Density: 1.68 g/cm^3
Escape Velocity: 23.5 km/sec
Gravity: 11.15 m/s^2
Distance from Sun: 4.4767 billion km (248.87 light minutes)
It is the smallest of the gas giants and is the first planet to be discovered by mathematical predictions in 1846. Neptune and Uranus are termed as ice giants because they are smaller and have different compositionality from the gas giants Jupiter and Saturn. Neptune is the smallest ice giant with a mass of 1.024 × 10^26 kg but has the greatest density out of all the gas giants.
Neptune however, excels from something else. It has the fastest wind speed of any planet. Wind speeds blowing westward on the equator reach up to 2,160 kilometres or 1.324 miles per hour, nearly a supersonic flow. Most winds travel retrograde to the rotation of the planet; they are 5 times stronger than the strongest winds recorded on Earth, breaking the sound barrier.
Neptune has a total of 6 known rings with some containing ring arcs or clusters of dust particles in a ring. It also has 14 known moons, the largest is called Triton, and it is the seventh largest known moon of any planet, also being the only one in the solar system that orbits in retrograde or in opposition to the planet’s rotation.
Bonus Fact : It is the only planet that is invisible to the naked eye