Pluto was a mysterious and legendary planet. It was located in the outermost layer of the solar system, about 149 light years away from the sun. At this distance, Pluto's brightness was so low that it was almost completely covered by the sun's light. Therefore, Pluto was considered one of the most easily overlooked planets in the solar system. We can see many unique features on Pluto. Its surface was covered with thick ice, which could reach tens of kilometers thick. In addition, Pluto also had some very strange rocks and minerals, the most famous of which was the Cassini Stone, which scientists called the most diamond-like rock on Earth. In addition to the ice and rocks, Pluto also has some mysterious caves and tunnels. These caves and tunnels can reach thousands of meters in length and have various strange shapes on the surface. There are also some paths that are said to lead to the underworld, but scientists have yet to find conclusive evidence that these paths exist. Pluto is a planet full of mystery and legends. Its surface and interior are full of fascinating features. If you have the opportunity to go to Pluto, I believe you will be attracted by the charm of this planet and deeply feel that it is a unique and mysterious existence in the solar system.