The four of them observed like tea, at first it was like Liu Xuan's prediction, no one bothered them, and no one forced their research materials, but they also took the initiative to send their research materials to the Federation, and at a certain time, someone will bring them rich food. The four of them didn't want to get out, and this appearance was no different from house arrest until three days later.

On this day, Liu Xuan just finished observing the location of the starfall, according to the accuracy of the federal detector, he can also detect that this thing is already close to Neptune, for human technology, this is already within the range of their strike, as long as it is ordered by the Federation, the missile will be launched directly.

If all goes well, especially safely through the asteroid belt, the missile and this starfall will collide near Saturn. According to Liu Xuan's estimate, if aliens don't have much technology, a missile should be able to solve this problem. The Federation left them for the moment only to detect the exact point of the starfall.

Of course, there are still accidents, after all, they don't know what kind of advanced technology this civilization has. However, just from the perspective of interstellar voyages, it is actually not much different from their Earth civilization. The earth is currently unable to carry out interstellar voyages, and a big reason is actually Liu Xuan, because he did not publish the research results in his hands.

As long as Liu Xuan announces this new type of engine, the earth has mastered the technology of interstellar voyage, although the speed is still not fast, but with the addition of Xuanmu's hibernation system, human beings have the opportunity to reach some places in deep space.

But Liu Xuan knows that this is still far from enough, and with the continuous development of human civilization, human beings still need more and more powerful interstellar voyage technology. But then it's time for deep-sea technology. At present, Xuanmu is trying to merge deep-sea technology and hibernation technology, after all, both technologies require liquids.

Deep-sea technology, which is the solution to the pressure caused by acceleration that humans can think of directly, places the human body in a special mechanism filled with fluid, and with the help of the cushioning effect of the deep-sea liquid, the human body can be protected from too serious damage as much as possible.

But interestingly, although this technology has been invented, there is still no application scenario, after all, the speed reached by the power engine still does not use deep-sea technology.

Three days passed in a flash, and although the four of them were in a hurry, they also needed orders from the Federation. When they observed that Starfall was already close to Neptune, they knew that the time had come for the Federation to need them.

Sure enough, when they once again habitually submitted their research results, they remembered the sound of a knock at the door. At this time, it was not yet time to eat, and they probably guessed that the time had come for the Federation to need them.

opened the door, and there was not a person dressed as a federal congressman outside the door, this turned out to be a man in a dark blue military uniform, this military uniform Liu Xuan had previously understood, this was the costume of the emerging interstellar team, but these people are generally active in space, how could they find the four of them directly.

"Hello, I'm Zhang Tianxue, are you Professor Liu's team?" Zhang Tianxue gave a very standard military salute, and then asked.

"Hello, I'm Liu Xuan, do you have anything to do with us?" Liu Xuan walked out as soon as possible, stretched out his palm, and shook hands politely with Zhang Tianxue.

"I was sent directly by the Federation to inform you, and the Federation asked the four of you to go directly to the low-Earth orbit command station, which is the Federation's newly built Guardian." Zhang Tianxue said to Liu Xuan.

"We want to know what our main task is?" Liu Xuan said to him with a smile. This is a professional smirk, Liu Xuan has gradually learned it after more contact with these people.

"Determine the exact route of the starfall so that we can carry out precise strikes. You also know that the preciousness of interstellar missiles, so to speak, the overall level of our Federation will be regressed by one year, so we don't dare to be careless, and the Federation has also recommended you to us. We also know your name, which is why we have ordered me to return to Earth to pick you up from our base. Zhang Tianxue explained everything clearly in one breath, and from his tone, he also felt the urgency of the time now.

"When are you leaving?" Zhang Tianxue has talked about this, and Liu Xuan is not good at asking more, and they still have time to understand when they get to the place.

"Now. If you don't have anything else to do, we're ready to go, and the plane is parked on the tarmac of the Federation Building. ”

"We don't have anything else to do, let's just go." Liu Xuan glanced at his companions, they all did not object, and Liu Xuan immediately agreed.

"Okay, this way, please." Zhang Tianxue was also very happy to hear that they had nothing else to do, and directly led the way in front of him to the place where the aircraft was parked.

At present, even Liu Xuan has seen this thing for the first time, it turns out that he has only heard of the existence of this thing, but he has never had the opportunity to see it, this time they finally saw this magical thing. Of course, Xuan Mu actually knows how to open it, but he practiced on the simulator, and he has never seen the real face of this thing.

The aircraft is actually similar to a real airplane, except that the windows are small, and the front part can seat a small number of people. The overall shape is the same as the original space shuttle.

Under the leadership of Zhang Tianxue, they also entered the interior of this aircraft, which was actually like the cockpit of an ordinary aircraft, without much difference. There are already other people on this side, and Liu Xuan has long expected that for such an important matter, it is impossible for the Federation to send only four people to calculate, at this time, of course, the more the better. Liu Xuan also knew that even if the scientists who did not go to the guardianship were on the ground, they had to be on standby at any time to calculate the simulation.

There happened to be four seats left, and the four of them were sitting for the first time, so they didn't know what to do, so they had to imitate the people who had already sat down, sat on the seats, and fastened their seat belts.

After seeing that the four or four people were all done, Zhang Tianxue also went to the front, that is, the driving position, and there was this person in front, it seemed that it was his colleague, or comrade-in-arms, wearing the same clothes, fiddling with various instruments.

"Prepare yourself, and we'll set sail at once." Zhang Tianxue said the last sentence, and then various instruments were turned on and ready to take off.

At first, it was like an ordinary airplane, and gradually it flew into the sky. Liu Xuan knows the working principle and process of this thing, so he naturally knows what the process is, and he also knows that the most critical process has not yet arrived.

After the aircraft reached the stratosphere, the cabin of the aircraft began to be gradually pressurized, and then the nuclear-powered engine in the rear began to work, and the roaring sound sounded, and the huge acceleration directly pressed their bodies on the seats and could not move.

They all knew that the aircraft was flying towards the outside of the atmosphere at this time, and the strong oppressive force also let them know that this aircraft was estimated to have reached the first cosmic velocity.

Finally, a few minutes later, they clearly felt the drop in gravity, and they were finally in space. Even those who have been studying space for a long time have come to Earth's low-earth orbit for the first time.

The four of them unconsciously cast their eyes outside, outside is a mixture of darkness and light, and at a certain angle you can see the blue earth behind the spaceship, beautiful, magnificent, and full of temptation. They all know how attractive such a planet is to extraterrestrial civilizations.

The speed of the aircraft was also gradually decreasing, and through the window in front of them they could already see the huge fortress-like thing, which was slowly rotating along a central axis, of course, they also knew that this slowness was only an observation by the naked eye.