The Underworld is the coldest and darkest place in the world. It is a place where souls and dead people live. In Roman stories, Pluto is the boss of the underworld; but in Greek myths, it is Hades. However, in the solar system, scientists have discovered a planet similar to the underworld, which is Pluto at the extreme edge of the solar system. It is very similar to the underworld that people know. Many even think that when human beings die, their souls will go there.
Pluto is at the extreme edge of the solar system, very far away from the sun, and there is almost no light. Its entire sphere is very dark, and the temperature is extremely low, having a surface covered by rocks. Its darkness, coldness and longness are almost equal to The underworld in various cultures. Scientists also discovered here that one year in the underworld is equal to 246 years on Earth.
Pluto was discovered by Clyde Tombaugh in 1930 and identified it as the ninth largest planet in the solar system. Because Pluto is so far and dark, it is considered the “underworld” in the solar system. Many people even think that when human beings die, the souls go there.
Although Pluto has been eliminated from the eight planets in the solar system, this does not affect scientists’ understanding of Pluto, especially when the US probe “New Horizons” arrived in Pluto’s orbit, giving people a chance to get a glimpse of it. Scientists have discovered that a year on Pluto is equivalent to more than 90,000 days on Earth, or 246 years.
In fact, Pluto and the earth also have some similarities. For example, there is a movement of its core, and its cracked surface is orderly. Maybe there are many unknown secrets on Pluto, but scientists can’t detect yet them.
Compared with the earth, Pluto may be destined to be an unsuitable place for survival because its atmosphere is very thin.
Many people also expressed regret, why is Pluto excluded from the planets? Interestingly speaking, this is actually mainly because there is a Kuiper belt near Pluto. There is a celestial body in the Kuiper belt about the same size as Pluto. Therefore, scientists identified it as a similar celestial body in the Kuiper belt and excluded it from the ranks of planets.
The Kuiper belt is a dense hollow disk-shaped area near the ecliptic outside the orbit of Neptune in the solar system. It is located in a low-inclination orbit 40 to 50 AU from the sun. It used to be considered empty and the end of the solar system but in fact, it is full of ice-bound asteroids with diameters ranging from several kilometers to thousands of kilometers.
Because Pluto is similar in size to the large asteroids in the Kuiper belt, some astronomers believe that it should be excluded from the planets of the solar system. At the end of the 20th century, it was even asserted that it should be included in the ranks of Kuiper belt asteroids; and the moons of Pluto should be regarded as its companion stars.