Neptune the planet of fish
Neptune is the outermost of the gas giant planets like Uranus has an atmosphere rich in hydrogen, helium and methane as well as having a tenuous ring system: it was discovered in 1846 but his position had been expected from the perturbations on the motion Uranus caused by the gravitational field.
Neptune has remained virtually unknown until close encounter with Voyager 2nel 1989: the atmospheres of Neptune and Uranus are very similar although the Neptune is the most turbulent and has a blue color in contrast to the blue-green Uranus, for because of a higher concentration of methane in the upper layers.
In 1989 the Voyager 2 photographed a large dark spot similar to the Great Red Spot on Jupiter's southern hemisphere: five years later when the Hubble Space Telescope observed Neptune, the stain was gone, but another similar formation in the northern hemisphere this time, appeared towards the end of 1994.
Both the technological tools revealed the existence of bands of high-altitude clouds of methane: the composition of the main mantle of clouds is still uncertain but it is likely the presence of hydrogen sulphide, while the interior of Neptune should be similar to that Uranus, composed of water, ammonia and methane that envelop a rocky core.
Of the eight known satellites Triton is the only one worthy of note, being the largest, 2700 km in diameter, with a surface that is covered with methane and nitrogen frozen at a temperature of -235 ° C, which makes the satellite the place coldest in the solar system.
Nitrogen jets protruding from the surface forming geysers and dark streaks around drawing, Triton has a retrograde orbit, which moves in the opposite direction with respect to Neptune, and it is thought that it was originally an independent body like Pluto, then captured by the gravitational field the planet.
Triton has actually larger than Pluto and the two may be physically similar: now you know the four rings, but with the satellites of Neptune, are too faint to be seen with amateur equipment.
The other satellites in addition to Triton, are Larissa, Proteus, which are closer to Triton and Nereid to Neptune the farthest.
Neptune never reaches the magnitude of 8 is therefore invisible to the naked eye.
In mythology was the god Neptune, lord and master of the oceans, the ruler of the seas but also the depths of the psyche, as well as ruler of Pisces to represent the depth of vision and the ability to expose their beliefs without being tied to common belief or feeling.