How can you be sure that Pluto has been orbiting the Sun and not recently entered the solar system?

Pluto (asteroid number: 134340 pluto; Astronomical code: , unicode code:

U+2647) is a dwarf planet in the Kuiper Belt. Pluto was the first Kuiper Belt object to be discovered. Pluto is the largest known dwarf planet in the solar system and the second most massive.

Among the celestial bodies that orbit the Sun directly, Pluto ranks ninth in volume and tenth in mass. Pluto is the largest overseas object, second only to Eris in a discrete disk.

Like other Kuiper Belt objects, Pluto is mostly made up of rock and ice. Pluto is relatively small, only one-sixth the mass of the Moon.

1. One-third of the volume of the Moon. Pluto's orbital eccentricity and inclination are high, with a perihelion of 30 AU (4.4 billion km) and an aphelion of 49 AU (7.4 billion km). As a result, Pluto periodically enters the inner orbit of Neptune.

Neptune and Pluto do not collide due to their orbital resonance with each other. At the average distance between Pluto and the Sun, it takes hours for the light to reach Pluto.

Pluto was discovered in 1930 and is considered the ninth largest planet. The study of Pluto and other celestial bodies in the solar system over the next 75 years challenged Pluto's planetary status. Since the discovery of the asteroid Charon in 1977, numerous ice-like objects with highly centrifugal orbits have been discovered, like comets.

The discrete disk object discovered in 2005 is even 27% more massive than Pluto. The International Astronomical Union (IAU) formally defined the concept of planets in 2006 after recognizing that Pluto is only one of many large icy objects in the outer solar system. The new definition excludes Pluto from the planetary range, classifying it as a dwarf planet (Pluto-like object).

Some astronomers believe that Pluto is still a planet.

The U.S. New Horizons probe became the first spacecraft to fly by Pluto on July 14, 2015. During the flyby, New Horizons made detailed observations of Pluto and its moons.

There is nothing special about Pluto, in fact, there may be 600-2,000 Pluto-like dwarf planets in the Kuiper Belt. The distance between Pluto and the Sun is only about 40au, and the radius of the solar system is almost 30,000au.

There is also the fact that Pluto does not orbit the Sun independently, but with his good brother, the dwarf planet Charon.

According to the analysis, Charon and Pluto had a major collision billions of years ago, and then the two sides returned to hydrostatic equilibrium and then circled each other. In 2015, New Horizons took back the **, and this analysis may be obtained.

Coupled with the fact that Pluto's orbit is so stable, I personally believe that Pluto should have existed at the beginning of the formation of the solar system.

The condition of the planet.

According to a resolution adopted by the International Astronomical Union on August 24, 2006, there are three main conditions for a celestial body to be called a planet.

1. The object must be in orbit around the Sun.

2. The object must have a mass large enough to overcome the solid stresses to achieve a hydrostatic equilibrium shape (nearly spherical).

In fact, there is no evidence that Pluto is certainly not an alien planet, but this theory must be the one who advocates and who adduces the evidence, and as long as you come up with solid evidence, everyone will definitely accept your theory.

I'll talk about why no one is studying this issue, because Pluto is really unlikely to be an alien planet, and most importantly, it's too close to the Sun. You may be thinking, this is not a joke, Pluto is so far away from us, the spacecraft flew for more than ten years to arrive, and it takes more than 200 years to circle the sun, you say it is too close?

But in fact, the gravitational range of the Sun can be extended to about a light-year, while Pluto's furthest from the Sun is only 49 astronomical units, a difference of more than 1,000 times.

In addition, although Pluto's orbit has a high eccentricity, it is not outrageous, more like the early solar system thrown out of the inner solar system, but if it is an alien planet, the most likely orbit is similar to the dwarf planet Sedna. You can take a look at Sedna's orbit.

Pluto's orbit, while eccentric, is not outrageous.

The gravitational range of the Sun can be extended to about a light-year, while Pluto's farthest from the Sun is only 49 astronomical units, a difference of more than 1,000 times.

Because Pluto is really unlikely to be an alien planet, the most important point is that it is too close to the Sun.

Pluto really can't be an alien planet, and the most important thing is that it's too close to the Sun.

Because Pluto is not very far from the Sun.

I don't know about it, I don't know how.

I really don't know much about this, so I have to learn it.

No. Pluto is located in the Coiper Belt, and there is also the spherical Ultra Nebula outside. The end of the solar system is beyond the nebula.

Beyond Pluto is the Ultra Cloud (web link).

There was Pluto, the nine planets of the solar system, which was previously removed.

The apparent diameter of the Sun seen from Pluto is on average only 1 40 on Earth, so the apparent area is on average 1 1600 on Earth

Looking at the Sun from Pluto, the Sun is still the brightest object in the sky, brightening at noon at about the same brightness as the full moon on Earth.

But the apparent diameter of the Sun is only about 1 40 of the Sun as seen from Earth. If you look at the Sun from Earth, the apparent diameter of the Sun is about 30, then when you look at the Sun from Pluto, the apparent diameter of the Sun is about only. Since the naked eye can only distinguish objects larger than 1, if you look at the Sun from Pluto, if you don't use a telescope, then the Sun is just a point of light, and you can't see the shape of a disk.

The Earth is even smaller and cannot be seen with the naked eye. However, since the Earth is much larger than Pluto, it is still possible to see the Earth with the help of a telescope.