A few days after the moon landing, a grand triumphal ceremony was held in Berlin, and Xiaolu entered the city of Berlin in an open-top car, surrounded by a procession, through the Brandenburg Gate.

Lin Youde gave a speech after Xiaolu entered the city.

"More than a decade ago, we were here to celebrate the victory of the war against aggression from the Old World, but in reality, as many naysayers criticized, we have only made a draw with the Old World, narrowly ruining their wolf ambition to erase the dawn of the New World and keep humanity sinking into darkness. But the old world still exists, we only let half the world shroud in the dawn of the new world, and we have not achieved real victory.

"But now, we finally have the opportunity to bring all the people of the world to the sun of the new world, which is the first step in colonizing the moon, and colonizing the moon is the first step in space colonization, this is the real progress of mankind, although this is only a small step for my daughter, but it is a big step for us as human beings. If she doesn't forget the words, this great victory will be perfect. ”

Lin Youde's words filled the entire "March 18 Square" with laughter.

After that, Lin Youde roughly talked about the future development of the universe, and drew a huge and inspiring pie for the masses. After climbing to the current position, Lin Youde regretted that painting cakes is a must, people need to get all kinds of promises, and they will be satisfied after getting the promises, and then if you fulfill the promises, of course, if you can't fulfill the promises, then draw a new cake.

Lin Youde can be regarded as understanding why some presidents in the United States have not fulfilled a few promises after taking office, and they can continue to fool people into voting for him when they are running for re-election.

After painting the pie, Lin Youde returned to Potsdam with Xiaolu that evening to attend the celebration of scientists and engineers.

The day after the conference, Lin Youde gathered his top astronaut scientists and engineers.

**

"Ladies and gentlemen, although we have landed on the moon, we are still a long way from colonizing the moon. For the first dozen years, the lunar colonies could only rely on the materials transported by the earth to develop, and we needed a large amount of blood transfusion to the colonies before the colonies became self-sufficient. This involves the biggest threshold in cosmic colonization. ”

After Lin Youde finished speaking, he looked around at his scientists, and was satisfied to see that everyone knew what he meant, and sure enough, these people had already considered this part.

"That's how to send a lot of supplies into the universe."

This is the threshold of space colonization, not only is the amount of materials delivered each time by rocket launch too small, but the cost of transportation is also too high.

"What do you guys think about that?"

As soon as Lin Youde finished asking, someone immediately said: "We already have room temperature superconducting materials, if the tokamak successfully runs steadily, there will be a continuous high-intensity current, how about building an electromagnetic emission orbit?" ”

"You mean accelerating something in orbit to the first cosmic velocity? Are you crazy, the wind formed by acceleration will blow everything around you away, and there will be friction in the track, and the heat generated by friction can melt all the steel. A rebuttal was immediately raised, and it looked like the meeting was destined to take place in a state of rhetoric.

"How about creating a very large gravity-free zone? In the Sahara Desert, a large-scale imaginary space manifestation is generated, creating a large gravity-free zone, and according to the calculation, as long as the radius is large enough, it can reach the stratosphere, and we can launch the spacecraft into orbit with a little more push. ”

"First of all, you have to get the spacecraft into orbit, and you still have to find a way to get it to critical speed, or do you need a lot of fuel for jet propulsion. Secondly, what happens to the sand of the Sahara after making that gravity zone? There will be an area of flying sand on Earth that is filled with hundreds of millions of tons of flying sand, and I think it will be very dangerous for any aircraft to enter it. When this gravity-free zone disappears, the sand falls to the ground, which is a free fall of hundreds of millions of tons of matter......"

In this way, several immature ideas were quickly overturned, the most reliable of which was to create a gravity-free zone to move with the spacecraft, but the embodiment of imaginary space is not a reaction that will disappear instantly, if that scheme is adopted, a long line of gravity-free zones will be left in the spacecraft's launch path, and these areas will not disappear until a few months later.

At this point von Neumann stood up and said, "We can make a machine that can replicate itself......"

"Dr. Neumann," Lin Youde interrupted Neumann, "that kind of machine, in the future, we may send it as the vanguard of mankind to open up the universe, but we can't build that kind of machine yet, because we can't condense our entire industrial production line into one machine." ”

As a science fiction fan, Lin Youde is of course extremely familiar with the von Neumann machine. In the famous sci-fi game "StarCraft", the main base of mankind is a kind of von Neumann machine, which can produce SCV, and then SCV can produce all the buildings of humans, which can produce all the units, and most importantly, SCV can produce the main base, that is, the self-replication of the main base.

But it's impossible to make that kind of thing now.

"I've heard all of your thoughts," Lin Youde took the opportunity to continue, "I have a more realistic idea here, do you remember the story of the Tower of Babylon?" ”

The scientists looked at each other.

"I'm not an expert in civil engineering, but it's impossible to build a tower into space," von Kármán said with a frown, "but...... We have a similar idea, and we have done some pre-research, which should be a more feasible solution, but ......"

"Tell me about your plan."

"We can hang a cable from an orbital flyer to the ground and then use a guò cable to lift the cargo. This system has many advantages, such as the fact that the cable itself cuts the magnetic inductance lines of the geomagnetic field, resulting in a large amount of current, which may not be enough to support the operation of the entire system, but does reduce consumption. For example, the lifting speed of the cargo box of the system does not need to be too fast, as long as the motor provides enough output to lift the cargo box itself, the rotation of the earth and the laws of physics will complete the rest...... But there are a lot of problems with this plan. ”

"Go on." Lin Youde smiled with satisfaction, he actually knew that the work done by Von Kármán and his department had just been deliberately mentioned.