Since millions of years ago, when primitive Homo sapiens looked up at the starry sky for the first time on the earth, mankind's exploration of the mysterious universe has never stopped.

has developed to this day, Xiao Yu has taken a key step.

Humanity has finally moved a whole light-year distance.

Although, in the universe, there is only one human being left, Xiao Yu.

Here, it's the Oort cloud, and here, it's a light year away from the sun, about 9.5 trillion kilometers away. Looking at the sun here is better than seeing Sirius on Earth. The sun has truly become an ordinary member of countless stars.

In the distance, a dark meteorite of about ten cubic meters flashed by, quickly rushing towards the sun.

Xiao Yu smiled bitterly. Because he observed that the meteorite's orbit had been altered because of the mass of his fleet. It is estimated that in thousands of years, it will enter the inner solar system, and after emitting a spectacular comet tail, it will be evaporated by the sun.

Here, hundreds of billions of meteorites are scattered in the vast darkness, and their total mass is estimated to reach about ten times the mass of the Earth. They are the remnants of the sun, due to the influence of Jupiter and other large planets, they did not be lucky enough to coalesce into a large planet like the Earth or Mars, but were expelled from the inner solar system in the gravitational battle billions of years ago, and came to this lonely place, where only a few meteorites can get the chance to meet the sun again.

It's too far from the sun. Stars as far away as the rest of the stars may also have an effect on them. It is expected that in millions of years, a star called Gliese 710 will pass them closely, and some of the Oort cloud will be captured by it, and another part of the star may be expelled from the inner solar system.

Xiao Yu commanded a village-level spaceship, flexibly approached a meteorite block with a volume of about dozens of cubic meters, and captured it into the hull. These meteorites contain some traces of the early days of the formation of the solar system, which is very helpful for Xiao Yu to study the evolution process of stars.

Except for the two meteorites observed by Xiao Yu, the Oort cloud is still as empty as the rest of the place. Xiao Yu's footsteps did not stop at all, and continued to pass at high speed.

The Oort cloud, is the final boundary of a star's shili range. Outside of the Oort cloud, there will be no more stars controlled by the Sun's gravity. Except for a faint starlight, the sun will not have any effect on this place.

Perhaps, five billion years later, when the sun dies, the planetary nebula she formed may spread here.

Countless times have passed in a hurry, and more than two thousand years have passed since Xiao Yu left Ooryun.

In the past 1,600 years, all the replacement parts that Xiao Yu had stockpiled were used up, and as a result, in the next 400 years, 50 village-level spaceships were abandoned. The parts on them were removed and installed on top of the rest of the ship, replacing their damaged parts. These fifty village-level spaceships are only an empty shell, and without their power system, they will not have the ability to continue to follow the large army, and Xiao Yu will not have the ability to carry them extra. Abandoned them, they can only float along a fixed track, in the endless universe, forever.

Along with these fifty village-level spaceships, there were also two township-level spaceships. Although the three county-level ships have also undergone a major overhaul, they still have the ability to continue sailing.

The entire voyage has covered 40 percent, a distance of four light years. If Xiao Yu's target is the chosen Centauri α, Xiao Yu has now reached his destination.

α Centauri, commonly known as Proxima Centauri, is a triad with three stars orbiting each other in chaotic motion. According to observations, there will not be any stable large planets there, so although it is the closest there, Xiao Yu did not choose there.

Over the course of two thousand years, Xiao Yu had passed through at least four large gas clusters, each of which reduced Xiao Yu's speed once, and then Xiao Yu had to accelerate and correct his course.

And every acceleration and course correction consumes a lot of fuel. However, thanks to Xiao Yu's reserves as much as possible at the beginning, the nuclear fusion fuel reserves are still optimistic, enough to support Xiao Yu's voyage to the Tianyuan Four Star Systems.

These gas masses, the largest one, were a light year long and more than a dozen light days wide, and Xiao Yu had traveled through them for more than twenty years before passing through it.

In the universe, there are quite a few such large gas masses. Even the solar system was born from such a gas mass. It was billions of years ago, and the gas mass began to contract slowly toward the center under the disturbance of a nearby supernova explosion. Eventually, in the center of the gas mass, the density of matter became higher and higher, and the nuclear fusion reaction was finally triggered, and the primordial sun was born.

The powerful stellar wind of the primordial sun blew away the dust that surrounded it, and then the dust slowly coalesced into planets that had been developed for billions of years before stabilizing and becoming what it is today.

If a star exerts some influence on this gas mass at this time, a star may also be born here in the endless future.

It's a pity that Xiao Yu doesn't have such an ability, otherwise Xiao Yu would be very interested in making a star out.

This gas mass reduced Xiao Yu's speed from 563 kilometers per second to 506 kilometers per second, and shifted Xiao Yu's course by one thousandth of a degree.

Interstellar navigation must be absolutely precise, and its precision requirements are even more precise than hitting mosquitoes on the moon on the earth. Because the distance is too long, the initial small error will be magnified countless times. If this thousandth degree error is allowed to go, Xiao Yu will pass tens of billions of kilometers away from his destination.

Fortunately, Xiao Yu has a pulsar navigation system. With the help of the signals of the six pulsars, the course was recalibrated, and Xiao Yu continued to speed towards Tianyuan Si.

Here, it is five light-years away from the sun and four or five light-years away from the heavenly garden. The voyage is about to be halfway through, and three thousand seven hundred years have passed since Xiao Yu set off from Saturn.

The number of village-level ships increased to 135, and the number of township-level ships increased to eight. However, the three county-level ships are still the same, and everything is working normally. The reason is very simple, the county-level spaceship has the greatest value, and usually, Xiao Yu dismantles the parts on the village-level and township-level spacecraft and installs them on the county-level spaceship. By sacrificing the small spaceship, the health of the large spaceship was exchanged.

Xiao Yu's fleet is like a group of refugees fleeing, along the way, there are constantly refugees who die of cold and starvation, and then are ruthlessly abandoned.

Although nuclear fusion is the most efficient energy source at this stage, and the materials used to build the spacecraft are the embodiment of Xiao Yu's highest material technology, they are still a little powerless in the face of a long time. Before Xiao Yu's science and technology make new breakthroughs, these losses are inevitable.

Here, five light-years from the Sun, the Sun's brightness waned even further, and at last it was obscured from the stars, and no more features could be found. The luminosity of Tianyuan 4 is getting brighter all the time. Even, without the obscuration of a few gas masses, from here, Tianyuan 4 is brighter than the sun.

In the past nearly four thousand years, Xiao Yu's technology has been developing, but only at the jishu level, for example, Xiao Yu has an updated photonic computer construction model, and it is expected that after the model is perfected, Xiao Yu will be able to create a new type of computer that is dozens of times faster than the current photonic computer, but the energy consumption and size are much smaller, such as the more efficient nuclear fusion application jishu, and the internal mechanism of the wood spirit strengthening material. Now Xiao Yu can already use some kind of strong magnetic field to simulate the process of strengthening materials for Wood Spirit, but the efficiency is not as high as that of Wood Spirit.

Another of the most significant breakthroughs is about the application of laser jishu. Laser application jishu,It can be divided into two aspects,The attack aspect is the traditional sense of the laser gun,Laser cannon,Defense,It is the legendary protective cover technology。 Now in Xiao Yu's heart, he has a preliminary inference about the energy protective cover, which is nothing more than using a strong magnetic field to restrain high-energy photons to form a protective film outside the hull of the spacecraft. It's just a specific verification, and it needs to wait until the four galaxies of Tianyuan have obtained sufficient material replenishment before it can be carried out.

In contrast, there is still no breakthrough development at the basic physical level. But Xiao Yu is not in a hurry. Xiao Yu believes that after arriving at the Tianyuan Four Galaxy and obtaining enough material replenishment to build a large particle collider around Tianyuan IV, it is only a matter of time before the breakthrough of basic physics theory is made.

Xiao Yu even had a faint speculation in his heart that if the Huantianyuan Four Large Particle Collider really found the Higgs boson, thus verifying the Higgs field, Xiao Yu would have the hope of obtaining an almost infinite source of energy, and at that time, all the difficulties that hindered Xiao Yu's voyage would be wiped out.

From here, too, the greatness of the theory of relativity and quantum theory can be seen. Even now, with the ability of interstellar navigation, Xiao Yu, who is more advanced than human technology for many years, in the final analysis, is still eating the old books of relativity and quantum theory.

The endless voyage continues. The village-level spaceship that was playing the vanguard suddenly detected a little unusual fluctuation.

It was a radio wave with some kind of pattern. Xiao Yu can confirm that this radio wave was not sent by himself.

This radio wave immediately attracted Xiao Yu's full attention. But because the duration of this radio wave was too short, Xiao Yu had no way to locate its emission source. After thinking about it for a while, Xiao Yu made a decision.