The famous star is a member of the discrete disk celestial body.

The entire territory of the solar system, from the inside out, can be roughly divided into the following regions if the asteroid belt is used as the boundary.

The first is the inner solar system, which contains the four rocky planets of Mercury, Venus, Earth, and Mars, as well as the asteroid belt.

Beyond the asteroid belt is the outer solar system, which contains the four gaseous planets of Jupiter, Saturn, Uranus, and Neptune.

As the name suggests, rocky planets are those that are mainly made of rocks like the Earth, with only a thin outer layer of atmosphere. This is not the case with gas planets, which, like Jupiter, are mostly made of gas.

The four inner solar system planets, and the four outer solar system planets – of course, now that the Earth has been destroyed, so they can't be counted now – make up what is commonly known as the Eight Planets.

The most distant large planet is Neptune. Celestial bodies other than Neptune are collectively referred to as overseas objects.

Regions outside of Neptune are also divided accordingly. The first is the Kuiper Belt.

The Kuiper Belt resembles the asteroid belt between Mars and Jupiter. It is also made up of many asteroids, the largest of which is Pluto, which is more than 2,000 kilometers in diameter. The small ones are like interstellar dust.

The Kuiper Belt is the source of short-period comets. In the past, comets that could be observed on Earth and could be seen once every few decades or hundreds of years, such as the famous Halley's Comet, came from here.

Further beyond the Kuiper Belt is the ecliptic discrete disk. The ecliptic discrete disk partially overlaps the Kuiper belt but extends farther away.

At this moment, the position of the human fleet is in the ecliptic discrete disk.

Here, Chen Yue saw a huge star that was roughly dark red.

It is the planet Eris.

Eris is about the same size as Pluto, but about 27% more massive than Pluto. At the beginning, it was its discovery that directly drove Pluto from its seat as one of the nine planets, and downgraded Pluto to a dwarf planet.

The reason is simple, Eris is bigger than Pluto, and if Pluto is a big planet, then there's no reason why Eris shouldn't be a big planet, right?

But if Eris is also listed as a large planet, then the rest of the series of stars with similar mass, such as Ceres, Haumeea, Ornisa and the like, can also become large planets?

As a result, the number of large planets in the solar system is not more than a dozen.

As a result, the International Astronomical Union on Earth at that time simply revised the definition of planets, directly driving Pluto from the throne of large planets, and uniformly defining Pluto, Eris and other stars as dwarf planets, thus reducing the number of large planets to eight.

This is also the reason why Chen Yue set up a low planetary-class warship between the comet-class and the satellite class in his own warship class.

As for why the satellite class is above the dwarf planetary level, it is because the large planets have many moons that are more massive than the dwarf planets, and these moons are closer to the big planets.

Eris is an extremely iconic star.

In the past, of course, Chen Yue's probe had also reached the planet. However, passing by this time, Chen Yue still mobilized some telescope observation time and carefully admired the dwarf planet.

There is also a large number of Torins on the surface of this dwarf planet, covering almost the entire planet, which is why the planet has a dark red color.

The dwarf planet's surface is not flat, with numerous peaks, basins, and ravines on it. Its highest peak, the one named by Chen Yue, even reaches a height of 12,000 meters, which is higher than the highest peak on earth, Mount Everest.

It is like a sharp sword, majestically pointing at the vast sky.

The height of the highest peak above a planet depends on the mass, volume, and material of the star. To put it simply, if the mountain on a planet is too high, the pressure it puts on the base of the mountain will be too great, and its own weight will collapse itself, so it cannot be too high.

Theoretically, the height of the highest peak allowed on Earth is about 10,000 meters. Mount Everest is 8,844 meters high, which basically belongs to the same magnitude.

But this is not the case with Eris. It is too small compared to Earth and has a lower gravity, so it allows for higher peaks. Just like the Eternal Peak at this moment, the height is 12,000 meters. The height of the highest peak allowed by it can theoretically be as high as about 30,000 meters.

After enjoying the beautiful scenery on the planet, the human fleet continued to move forward.

After sailing for a while, another star came into Chen Yue's line of sight.

This dwarf planet is about a thousand kilometers in diameter and is also a behemoth. Its surface is also covered in Torin, and it also has a dull red color.

Here, it has moved out of the area of the ecliptic discrete disk and into a more outer-open space.

The space between the ecliptic discrete disk and the Oort cloud.

For this space, Chen Yue did not give it a unique name.

This space is also extremely vast, covering an area from about 200 billion kilometers from the Sun, the outer side of the ecliptic discrete disk, to about 700 billion kilometers from the Sun, which is the inner side of the Oort Cloud.

The stars that exist in this area are called independent stars. The reason for "independence" is that the stars that exist in this region are so far away from the outermost big planet, Neptune, that they are basically not affected by its gravity, not to mention Uranus, Saturn, Jupiter and the like in Neptune.

So they are "independent".

Among them, the most typical star is the one that Chen Yue saw at this moment. At the beginning, the people on the earth called it Sedna.

This is also a valuable star. Because it's so far away, so far away that it's basically unaffected by the rest of the stars. Because of this, it preserves many traces of ancient times, like rock faults on the earth.

By analyzing these traces, Chen Yue will be able to know the history of the solar system, what happened in the solar system hundreds of millions or even billions of years ago, and the evolution of the sun in the past billions of years.

It's like a "planetary museum" with a history of the solar system.

This is extremely beneficial for Chen Yue's understanding of the evolution of stars and galaxies.

In the past hundreds of years, Chen Yue has been dedicating a little computing power to maintain his research and exploration of Sedna. But at this moment, about to leave the solar system, Chen Yue can only erase all the traces that exist on Sedna.

Beyond Sedna's orbit, the human fleet continued to move forward.