Time passed, the research room finally obeyed the orders of the superiors, and sent the signature of the agreement to the earth through the wormhole, for these, in fact, the researchers still have a little luck in their hearts, after all, the superiors are only political scientists, not astronomers and physicists, so they don't know much about the strength of this electromagnetic wave, and now everyone in the institute just hopes that the strength of the electromagnetic wave is not enough, and the other party can't receive their information.

With the passage of time, there is no more news in the universe, and through Professor Ma's fine adjustments, the "Jupiter-3" observer has completely become a machine for observing wormholes, observing the state of wormholes 24 hours a day.

For the lack of news, no one can say what will happen, now, what they know is that once the radio wave is discovered by the extraterrestrial civilization, it will definitely calculate the specific location of the earth, they can't think of what other means the other party has to deal with it, according to the law of "dark forest", if the other party does not send a fleet to attack and occupy the earth, so that the earth becomes their colony, the other possibility is to launch some attack weapons, the earth civilization will be completely destroyed, no matter what the result, it will be a disaster for human civilization.

For these, this is not something that Liu Xuan has to think about now, Liu Xuan and Professor Ma's research team, a total of 20 people, have been studying nuclear fission engines since returning from the meeting a year ago.

Now Liu Xuan is not the same as when he first came, although he has only studied for a year, but the high-intensity work and unhealthy diet make the current Liu Xuan look very old, although he is only thirty-one years old, Liu Xuan is already full of wrinkles, he is full of black hair, there are already a lot of white, and his hair is also thinning a lot, this is mainly Liu Xuan's small problem, thinking about it and wanting to pull his hair, but now his hair often falls out by itself.

Professor Ma, who was originally a reincarnation of cancer, is also very fast, Liu Xuan has been studying the structure of aero engines, Professor Ma has led several people to study suitable nuclear fuel, and finally finalized uranium 235, the raw material of the atomic bomb. As far as the current technology is concerned, uranium-235 is prone to fission reactions.

This is a torment for everyone, Liu Xuan has been to see a psychiatrist many times, and he always feels that his psychology has changed. In this kind of closed crazy research, although Liu Xuan does not admit it, it is true that he has depression.

In a year's time, many people appeared, and many people left, and many of these people who left died of sudden overwork. The body of the deceased will be cremated and buried in a corner of this huge city, that place Liu Xuan and Professor Ma have been, the geographical location is very good, located in a high position, standing next to the tombstone, you can see all the cities under your feet, there are real trees growing here, not formed by holographic projection technology, in order to make these plants, mainly pine trees can grow healthily here, it did not hesitate to spend a lot of effort to install a lot of systems, simulating the real natural world, especially sunlight.

It's been a year, Liu Xuan hasn't gone out of the dungeon, obviously, it's difficult to get in, and it's even more difficult to get out. Fortunately, there is still a human touch on it, and those who take a leave of absence to go home to visit relatives will still quickly agree. When I went out, I had bodyguards behind me, on the one hand, to prevent anyone from persecuting the researchers, and on the other hand, I was afraid that the researchers would leak their secrets.

The artificial sun next to the tombstone has very little power, and it is difficult to create a large artificial sun, so it is difficult to dissipate heat. However, that first time made Liu Xuan feel relaxed. The sun shone on Liu Xuan's face, and Liu Xuan's face showed a feeling of intoxication. Professor Ma stood next to Liu Xuan, the sunlight reflected by his silver-white hair was like the afterglow of a setting sun.

Six months, coupled with the notes left by his father, Liu Xuan had preliminarily completed a small model of the nuclear fission engine, and sat down for experiments, the first experiment had an accident, the nuclear fuel leaked a little, and the most recent researcher at that time struggled for four months, or returned to the embrace of the sun. On the day of the memorial service, Professor Ma's eyes were red. However, Liu Xuan knew that doing this kind of thing was dancing on the tip of a knife, and if he was not careful, he would die.

For the remaining six months, Liu Xuan and Professor Ma's team have been conducting experiments, and only ten of the original 20 people have been left in the final machine, and three of them are still lying in the hospital fighting against fate. Professor Ma and Liu Xuan have long been regular visitors to the hospital, and they are forcibly sent to the hospital every three days for nuclear radiation treatment.

After the first accident occurred, Liu Xuan and Professor Ma's laboratory changed locations, and a lead wall with a thickness of tens of centimeters was mainly to prevent radiation leakage from accidents.

At such a price, Liu Xuan and Professor Ma finally came up with the final design drawings and principles that can be used in practice. Ghostwritten by Liu Xuan and signed by Professor Ma's team, an application report and research report were handed over to Li Ping.

After Li Ping received the report, without the slightest delay, he directly entered the office and passed the news to his superiors through a special channel, and the superiors were of course ecstatic about the news, and in less than a day, the news came, asking the whole city to cooperate with Liu Xuan and Professor Ma to build the first real nuclear fission engine prototype. The nuclear fission engine has finally been transformed from a model to a real thing.

"It's a little bit more subtle to rework this part, try not to leave gaps, it's a direct release from the nuclear fuel, and if there is a leak, it's unimaginable." Liu Xuan said to a processing person. The processing personnel naturally didn't dare to refute at all, he knew that this thing was simply careless.

Although only a few high-level personnel in the whole of mankind know about the nuclear fission space engine, Liu Xuan still told himself over and over again in his heart that this is the cause of all mankind, not the means of some politicians.

"Liu Xuan, I have prepared the nuclear materials, just wait for you to prepare the fuel and wait for the order of the superiors." Professor Ma didn't know when he came to Liu Xuan's side and said to Liu Xuan.

Liu Xuan nodded, looked at the outside of the city, after many understandings, Liu Xuan knew that there was a huge elevator at that location, even if it was the tonnage of the rocket, it could be directly transported to the ground for launch, which was also the pinnacle of human civilization.