Neptuun
Neptuun is the eighth and farthest known planet from the Sun in the Solar System. It is an ice giant and the fourth-largest planet by diameter. Neptuun is also the third-most massive planet, smaller only than the three gas giants, Jupiter, Saturn, and Uranus. Its diameter is about 49,500 kilometers, and its mass is approximately 17 times that of Earth.
Neptuun has a blue hue due to the presence of methane in its atmosphere, which absorbs red
The planet has a system of rings, though they are much fainter and less substantial than Saturn's.
Neptuun was the first planet discovered through mathematical prediction rather than observation. Its existence was inferred