Initially, people were unaware of Neptune's existence. With the discovery of Uranus, the attention of the astronomical community turned to it. The peculiar orbit of Uranus caught the scientists' attention, leading them to attempt to explain this phenomenon through Newtonian mechanics. However, Uranus's actual position consistently differed from predictions, putting research in a difficult position. At this point, two obscure astronomers, Adams and Leverrier, proposed a bold hypothesis: the deviations in Uranus's orbit were caused by the gravitational pull of an unknown planet. Through precise calculations, they inferred the location of this planet, which Leverrier eventually communicated to Galle at the Berlin Observatory. In 1846, Galle discovered Neptune at the predicted location, and this planet became known as the 'wonder under the pen tip.'
Neptune is similar to Uranus in many ways and is considered a twin brother in the celestial family. They have comparable sizes, masses, and densities, with very similar chemical compositions and internal structures. Neptune's atmosphere mainly consists of hydrogen, methane, and ammonia, giving it a distinctive blue color. In 1989, the Voyager 2 spacecraft visited Neptune, revealing more information about this mysterious planet. Neptune has four rings and one dust shell, along with eight moons orbiting it. The most notable feature is the 'Great Dark Spot,' a massive, continuously changing cyclone similar to Jupiter's Great Red Spot. The issue of Neptune's rings was also a topic of debate until the arrival of Voyager 2, which finally confirmed that Neptune indeed possesses rings.
