Li Qingsong has always been curious about the Oort Cloud. That is, the Oort Cloud... does it really exist? Although various theories of solar system evolution support the existence of the Oort Cloud, and some celestial bodies suspected to be from the Oort Cloud have been discovered within the solar system, such as comets and asteroids, the real Oort Cloud has never been observed by humans, not just Li Qingsong. It is estimated that there may be trillions of celestial bodies in the Oort Cloud that are larger than 1 km in size, and even billions that are larger than 20 km in size. The total mass of the Oort Cloud objects is more than five times the mass of the Earth. More mass than five Earths was scattered around the edge of the solar system, never seen by anyone. It may seem difficult to understand how so many objects and masses could have never been seen, but the reason is simple. The Oort Cloud is simply too vast. The area between light-years and light-years from the sun may belong to the Oort Cloud. The total volume of this area is about 117 trillion trillion trillion cubic kilometers, which is five times the mass of the Earth, about 3*10^25 kilograms. If this mass is spread over such a vast area, the average mass per cubic kilometer is only trillionths of a gram, which is roughly equivalent to a few hundredths of a particle.
A mass five times that of the Earth may seem huge, but it is still too small compared to such a vast area, and the dilution of matter here is still too high. It is not easy to find a celestial body that may be only tens of kilometers or even tens of meters in size in such a vast space. But verifying whether the Oort Cloud really exists is of great significance to Li Qingsong. This will enable him to perfect his theory of the evolution of the solar system and further increase his understanding of the universe. This will not bring visible benefits in the short term and cannot be converted into combat power or specific technology, but it is extremely important in the long run. Human civilization, no, Li Qingsong believes that all knowledge and all physical theories mastered by all intelligent life are essentially an understanding of the universe. How much one understands about the universe determines how much knowledge a civilization can master, and thus how high its technology, combat power, and survival ability will be. Studying the origin of the solar system is a process of enhancing our understanding of the universe. If I can reach a higher level of technology in the future, I will also conduct research on more galaxies and larger cosmic structures. At this distance, Li Qingsong controlled many unmanned exploration spacecraft to leave the fleet and disperse in the vast space. Like a sieve, he began to carefully screen in this vast space. The distance between the farthest unmanned exploration spacecraft and the main fleet reached about 100 million kilometers. With the main fleet as the center and 100 million kilometers as the radius, Li Qingsong's detection cross-section reached about trillion square kilometers. Taking this place as the starting point, and assuming that the edge of the Oort Cloud is 1 light year away from the Sun, then sailing from here to the edge of the Oort Cloud is equivalent to Li Qingsong scanning, detecting and searching a cylinder with a base area of 314 trillion square kilometers and a height of about 1 light year. The volume of this cylinder reaches about 229 cubic kilometers, accounting for about billionths of the total volume of the Oort Cloud. According to existing theories, the total mass of Oort cloud objects is five times that of the Earth, or 3*10^25 kilograms. Assuming that these substances are evenly distributed, then by scanning a volume of trillionths, from a probability perspective, approximately *10^14 kilograms, or about trillion tons of matter, can be found. trillion tons of matter, based on the theoretical average density of comets or asteroids in the Oort Cloud, which is about grams per cubic centimeter, is roughly equivalent to an asteroid with a radius of 67 kilometers, or 300 asteroids with a radius of 10 kilometers. In general, if the existing theory of solar system evolution is correct, then the probability of discovering Oort Cloud macroscopic matter during this journey is still very high. In the vast void, Li Qingsong controlled this huge fleet to continuously accelerate and scan all the void around it. Time passes quietly like this.
Li Qingsong discovered that the density of matter in the space he was in was constantly decreasing, from about 3 to 10 particles per cubic centimeter around the solar system to about to particles per cubic centimeter now. The density has been reduced by more than ten times. But one very special thing is that the "temperature" here is very high, even reaching tens of thousands degrees Celsius. On Earth, temperatures of tens of thousands of degrees Celsius can melt everything, but here, temperatures of tens of thousands of degrees Celsius cannot melt anything. If the clone is thrown into this high temperature, it might be slowly frozen to death. The reason is simple: temperature is an indicator of the average kinetic energy of particles. The particles here are moving very fast, which means the temperature is very high. However, their material density is extremely low. Even if the kinetic energy of a single particle is very high, the overall energy is still extremely low from a macroscopic perspective. This results in a scene where high temperature and freezing to death coexist at the same time. This seemed to be somewhat different from previous expectations. Li Qingsong decisively sent more scientific research forces to study this phenomenon and try to find the reasons behind it. Even in this vast void where there is nothing, there are still too many physical phenomena that Li Qingsong has never seen before. This migration is not just a migration, but also a scientific research journey. Time passes by in constant observation, constant research, and constant acceleration. Several years passed quietly, and the fleet finally accelerated to the predetermined maximum speed. Li Qingsong's migration fleet was faster than the Bluetuk people's migration fleet, reaching 4% of the speed of light, or about 12,000 kilometers per second. At this moment, the fleet reached its maximum speed and stopped accelerating. The gravity that had been covering the entire fleet and was equivalent to about 1/250 of the Earth's gravity due to the acceleration finally disappeared. The blueprint people and clones living in the roller spaceship finally no longer have to suffer from the tiny gravity that is always there and seems to be pulling them to one side. At this moment, the distance between the fleet and the sun has reached trillion kilometers, about light years. At this distance, Li Qingsong looked back at the sun again. In the sky, the sun is still extremely bright and conspicuous. The Sun seen here still has an apparent magnitude of about . If you stand on Earth, Venus is the brightest celestial body in the sky except for the sun and the moon. But its brightness is only .
