Neptune, a planet extremely cold and dark, stands at the outer edge of the Solar System.
Astronomers did not know anything about it until the transit of the probe Voyager 2, in 1989. When it sent the images to Earth, they were astonished.
In spite of its quiet appearance Neptune has got the most turbulent atmosphere of the Solar System, with storms as big as Earth and icy winds, which are ten times faster than a hurricane.
Neptune has got visible magnitude 7.7 and therefore it can be observed through binoculars. It is slightly bluish; the disk details cannot be easily distinguished in any circumstance.
