In general, international students from other planes don't like to move around much. Although human beings have entered the age of astronautics, interstellar travel is no longer a dream, except for some relatively wealthy people, ordinary free people still rarely have the opportunity to carry out interstellar travel. Then there is the extremely strict security check of the home planet, and it is difficult for idle alien creatures to have the opportunity to communicate and learn on the home planet, at most, on other planets in the solar system, to observe and learn.

Therefore, the chance for the freedmen of the home planet to see aliens is still very rare. For these strange-looking alien species, the average freedfolk will always show unusual enthusiasm and curiosity. Even Ye Yu, who saw this group of guys for the first time two years ago, was taken aback!

Every time he sees them, he can't help but laugh. It can't be helped, because these guys look too much like toads. Of course, it's not to laugh at them for being ugly, because while you laugh at them for being ugly, they might also think you're ugly. After all, the aesthetic standards of each civilization are different.

No matter what this group of toad-like alien creatures think, anyway, in Ye Yu's eyes, the way Xiao Moss laughs is really beautiful. The sandalwood mouth is slightly open, and the jade hand covers the face, which is a kind of reserved and subtle beauty, but it is often more moving than the romantic smile, and it is a bit of an artistic conception of "holding the pipa and half covering the face".

Otherwise, it is very impolite to openly laugh at other people's appearance. In fact, even so, Ye Yu didn't think there was anything wrong with it, after all, the civilization system was different, even if you were laughing at it, they might still think that you were showing favor to them. Perhaps their human mentors had already taught them what it meant to laugh. But it's hard for them to understand that different smiles mean different things.

However, the strange eyes and pointing are believed to be common to two civilizations. So, it's no wonder that these guys have such a big homebody. If you are stared at like a monster as soon as you go out, you will definitely rarely go out.

The universe is vast and infinite, and there are not a few civilizations born in it. However, in the distant primeval period. People still think that they are the only ones in the universe? The history of human exploration of the universe is very early. This is recorded in many historical classics. However, due to the limitations of the science and technology of the times at that time, countless explorations could only end in the end.

It is believed that the scientists of that era looked up at the starry sky. I have also exclaimed: What is the universe? What exactly is beyond the universe? I don't know the universe. Are there intelligent beings like you? Are humans really lonely?

These are to the universe. The torture of the unknown has always been imprinted in people's hearts. Later, with the passage of time, the primeval human beings entered a period of great scientific and technological development. Space technology is developing rapidly, and the era of astronautics is coming.

When the time came to the time before the arrival of the Great Yan Period, the ancient scientific and technological civilization had developed to a peak, reaching a height that even today's human beings should look up to. This can be seen from the ancient ruins found over the years. But even at that time, humanity was still lonely.

It was not until the beginning of the Great Yan Era that people discovered another civilization other than themselves on the other side of their plane, which was called the first intimate contact and caused a sensation for all mankind. And that civilization, which is now known as the Blue Mercury civilization, is a friendly neighbor of mankind. Later, human beings have explored the universe more deeply, and finally put forward their own unique criteria for dividing the universe into hierarchical regions. The Blue Mercury civilization and human civilization are grouped under a single plane, which is called the total galaxy plane.

The universe is about 16 billion years old, a whole composed of space, time, matter and energy, without a specific shape, and in a dynamic at all times. The universe is vast and endless, and with the deepening of human exploration, human beings have artificially divided it into different hierarchical areas in order to distinguish their position in the universe.

First of all, there is no doubt that everything is in one universe. Starting from a singularity explosion about 18 billion years ago, the universe was born, and then time and space had a landing point and existential value. As for what the universe looked like before the Big Bang of the Singularity, what was it out there? I believe that whether it is in the primeval period or the Great Yan Period, these are the eternal themes of human beings.

Because the universe is too big and too far away from each other, human beings call the regions within their own itinerary a plane. Just like a sphere, there are countless points on the sphere, and when the two points are close to each other, relative to the entire sphere, it is equivalent to a plane, which is what people call a plane.

Therefore, if a region is to be classified as a plane, two conditions need to be met, one is that the area must be within the limit range of human beings, after all, the universe is too big, and there are many places, even if human beings are poor for a lifetime, life after life, it is impossible to reach. In this way, the area that exceeds the limits of human navigation does not belong to one plane, but is classified by people as another plane. Interstellar voyages between planes need to be achieved in another way.

The second point is the plane theory, which is also the standard of human limit distance, because only within the limit distance of human interstellar travel, between points, will it be equivalent to being on a plane. So, these two points are also equivalent to one point.

In fact, this so-called theory of interstellar division was sorted out and put forward by human beings themselves. It is also applicable only to the total galaxy plane where human beings are located, and as for the alien civilizations in other planes, they have their own classification criteria.

When a point on the sphere wants to go to the opposite side of the point, because the distance is too far away, it is beyond the scope of a plane, which requires the form of plane teleportation to achieve it.

The so-called plane teleportation is actually a space transfer method developed based on the black hole, the highest form of existence of the universe star. Originally, the two points existed independently on the two planes of the sphere, very far away from each other, but the appearance of the teleportation black hole connected the two points, and through the unique properties of the black hole, the collapse of the internal space, compression, so that its volume continued to decrease, and finally the two points were recombined into a point.

The two planes, which are very far away and impossible to reach by traditional interstellar voyages alone, can be reached in only a moment through a black hole, because theoretically speaking, the two planes are actually the same point.

Of course, not every black hole has a space teleportation function, and it should be said that the vast majority of black holes do not have a space teleportation function.

How this kind of black hole with teleportation function is formed has always been a mystery, after all, in the actual formation process of teleportation black holes, the various changes produced by it are far from being as simple as people reason. There are even many theories that people reason about and think they are perfect, but they are fundamentally wrong. After all, most of these so-called reasoning are difficult to prove with experiments. Take, for example, the black hole teleportation theory.

Since the beginning of the Great Hybrid, a human space fleet, by chance, entered a teleportation black hole and discovered the mysteries of the plane, human beings have not yet discovered a second black hole with this function, and that black hole has thus become the only channel for the civilization of the total galaxy where human beings are located to communicate with other planes.

Speaking of which, it is necessary to introduce black holes. Generally, the mass and density of black holes are extremely large, and the temperature is extremely high, but they are not like other stars, they can emit light, but even the surrounding light is absorbed by it, and at the same time, it continues to devour all the surrounding matter, the mass continues to increase, but the volume is gradually governed by internal collapse, and when it shrinks to a point, it becomes a singularity. This is the development of black holes in general, and it is said that the universe originally existed in the form of a singularity. Therefore, the black holes in the universe are also called small universes.

However, that special black hole broke through the barrier between two points on the spherical surface at the same time as the internal space collapsed, successfully connected the two points, and recombined the two points into one point through the compression of space. This point has already been said before, so I won't go into details.

Because time and space in the black hole space do not exist, when a spacecraft carries out black hole teleportation, time can be ignored. Therefore, two planes that were originally countless light-years apart can be reached in a split second through a black hole.

It can be seen that the universe is so big that there are really no wonders. The only teleportation black hole known to mankind is the Virgo black hole teleportation point about 50 million light-years away from the solar system.

Within the total galaxy plane, the division of regions is much more arbitrary, star fields, galaxies, constellations, stars, planets, satellites, comets, most of which are theoretical achievements left by predecessors. Although some unknown changes have taken place in the universe due to the arrival of the Great Yan Period, so far, these changes are still unknown, or in other words, with the current technology of human beings, these changes have not yet been discovered. So, many of the theories are still being used today.

These green-skinned alien students came to the Great Galaxy Plane through the black hole teleportation point in Virgo. And every time the waypoint is opened, there are also many human students who go to another civilization that has established a friendly alliance with mankind to further their studies and learn the advanced things in their civilization.

Of course, there are more strong people who serve the Dao, teleporting to other planes through the black hole and breaking through the stars. And what is the world world like outside? Ye Yu is also waiting to see. It's just that it's too early to talk about this, after all, he is not even a servant now, and his strength is still weak and pitiful. However, he believes that this day will not be too long, because once he achieves the convincer, his strength will take a qualitative leap. (To be continued......)