Chen Yue believes that there should be more than one, or a few, celestial bodies like Saidna in this area. There should be a lot of it.

But the area was too far away, the sun's rays were too faint, and the Sedna-like object was too small. When he was in the Jupiter system, even with Chen Yue's technology that had stepped into the third-level civilization level, he could only rely on luck to search for celestial objects similar to Sedna.

Coupled with the fact that he had too many things to do, he didn't put too much computing power into this area, so he didn't find a single other celestial body other than Sedna.

At this moment, the fleet poured out of the nest and happened to pass this area, Chen Yue gathered his observation force and began to carefully examine this space.

After some searching, Chen Yue really found several other celestial objects similar to Sedna.

One of them, estimated to be about 500 kilometers in diameter, also has a dark red color. This indicates that its surface is also covered by Torin. But because the distance was too far, it was too late to send an unmanned exploration spacecraft, so Chen Yue had no choice but to give up.

The rest of them, which are also hundreds of kilometers in diameter, are also dark red, with ravines on the surface, similar to Sedna.

One of them is only tens of billions of kilometers away from the closest route of the human fleet. Chen Yue thought about it for a while, and still sent a small scientific research spacecraft over to explore on the spot.

As soon as the research ship broke away from the human fleet, it immediately slowed down violently, adjusted its course, and began to fly towards the dwarf planet.

The human fleet is still unstoppable.

At this moment, the speed of the human fleet has reached about 18,000 kilometers per second. At the moment, the human fleet is 800 billion kilometers from the sun.

From this moment on, the human fleet truly entered the Oort Cloud category.

The Oort cloud is one of the most spacious regions of the solar system.

Its regional boundaries are not precise. Some people in the Earth Age believe that it is as far as 0.36 light-years from the Sun, others think it is 1 light-year, and some think it is 2 light-years.

Chen Yue, who was already in the third-level civilization stage at this moment, after more detailed research, believed that the territorial boundary of Oort Cloud was about 1.2 light years.

In other words, from 800 billion kilometers from the sun, about 1 light moon, to 1.2 light years, this span is up to 1.1 light years, that is, about 10.56 trillion kilometers, all belong to the Oort cloud.

The Oort cloud is the outermost layer of the entire solar system. After crossing the Oort cloud, it is considered to have truly left the solar system.

In the past, Chen Yue did not make detailed observations in the Oort cloud area. He hadn't even sent a probe here.

It's not that there is no technical strength, but it is really unnecessary.

Because the Oort cloud is so empty, there is no target worth detecting in it.

According to Chen Yue's estimates, the total amount of matter in the entire Oort cloud region is only equivalent to about three earths.

It is only equivalent to the mass of three Earths, distributed in a space with a total volume of about 5.5 cubic light-years, and its material is so thin that you can imagine.

The human fleet is unstoppable. At the same time, all the optical telescopes in the fleet began to make full efforts to make observations, hoping to find even a single macroscopic object.

This search took a full year to pass. Chen Yue still hadn't found a macroscopic celestial body that was only the size of a football.

The substance is just too thin.

At this time, the research spacecraft that had been sent to the Sedna-like object had finally arrived. On a cliff section there, the robot explored it in detail and transmitted the data.

The whole has a dark red cliff section, and the bottom layer seems to be mixed with some of the rest of the colors. Chen Yue carefully identified and found some unusual elements, such as the decay products of certain radioactive elements.

"Sure enough, the early activity of the sun was really violent."

Chen Yue sighed.

Looking at the traces left on the cliff, he seemed to see the sun in its early formative years.

At that time, the sun had just collapsed from the primordial nebula, nuclear fusion was lit up, and violent radiation swept across the solar system.

At that time, the earth had not even formed, and it was just a small "star". The matter in the solar system is moving chaotically, constantly colliding, accumulating matter, and the planets are gradually growing......

At that time, high-energy radiation from the sun directly bombarded the strata of the dwarf planet, forming some radioactive heavy elements. The unstable heavy elements slowly decayed, and then transformed into the rest of the elements, and were finally sealed under the strata of this dwarf planet, spanning billions of years, and finally appeared in front of Chen Yue's eyes at this moment.

The weight of history and the length of time are coming.

After some exploration, the small research ship eventually took off and moved away from the planet. In the middle of the vastness of space, Chen Yue detonated the hydrogen bomb inside it.

With a dazzling burst of bright light, this small scientific research spacecraft vaporized in an instant, turned into interstellar dust, and completely disappeared without a trace.

The human fleet was still moving forward, and in the continuous search, Chen Yue finally found the first Oort Cloud Celestial Body in the macroscopic sense.

It is an asteroid that is only about 100 meters at its longest point and has a fist-shaped appearance.

At the moment, it is trillions of kilometers away from the sun. But even at such a distance, it still orbits the sun. It is estimated that it takes up to millions of years to revolve around the sun.

At the same time, its connection to the sun is very weak. Chen Yue knew that if he hit it with an electromagnetic cannon projectile at random, the kinetic energy given to it could directly make it have the speed to escape from the solar system. When the time comes, it will leave the solar system forever and never return.

In a holistic sense, it is still part of the solar system. Because the gravitational pull from the sun still dominates the movement of all the celestial bodies in this area. But it's not because the sun is strong enough, it's that the rest of the stars are so far away that the gravitational pull that extends here is even weaker.

The division of the Oort cloud follows the principle that if the gravitational pull of the remaining stars on the celestial bodies at this location is greater than the gravitational influence of the Sun, then this place is the boundary of the Oort cloud and the boundary of the Sun's territory.

For this asteroid, Chen Yue still sent a scientific research spacecraft to study it on the ground.

However, because the current speed of our fleet is too fast, after slowing down, it is impossible for this scientific research spacecraft to catch up. Therefore, the fate that greets it will also be completely vaporized by a hydrogen bomb and completely disappear traces.