Neptune is the planet farthest from the Sun. It takes 165 Earth years to complete its very long orbit. It is an icy planet with an approximate diameter of 49,500 km. It is mainly composed of hydrogen and helium, with small amounts of methane and ammonia in its atmosphere, which is quite active.
It has the fastest winds in the solar system, which reach speeds of up to 2,000 km/h. The temperature in the upper part of its atmosphere is very cold, around -218°C. Neptune has a weak ring system, just like Uranus. One day on Neptune lasts 16 hours. It has 14 known moons.