Neptune (Neptune) planets Neptune is the fourth largest in the solar system's capacity by up to 60 satellites at an average distance. 4,504 million kilometers from the sun is far from the world that they can not be seen with the naked eye. Requires only large telescope It will be seen as the flickering. What men know about Neptune today, it is derived from the Voyager 2 spacecraft, which orbit close to Neptune on 2532 survey.