If the "space elevator" technology can really be realized, it will undoubtedly bring a significance to the earth's aerospace industry that is no less than the industrial revolution.

The safety of the "space elevator" is incomparable to that of the launch vehicle, and the safety of the "space elevator" is undoubtedly many times higher than that of the launch vehicle that explodes from time to time.

Similarly, the cost of transportation of a "space elevator" is much lower than that of a launch vehicle. At present, the cost of transporting a kilogram of materials to geosynchronous orbit (GEO) is about 25,000 US dollars, and if the "space elevator" can really be built, then this cost will be immediately reduced to 20-40 US dollars per kilogram.

These two advantages alone are enough to make those scientists look at this technology, which is still theoretical.

However, although the theoretical superiority of the "space elevator" is far superior to that of a launch vehicle using chemical fuel, the decision to build a "space elevator" is also an approach that has to be taken under the current technical situation.

Because to build a "space elevator", it is necessary to overcome many technologies that are not yet available to humans.

The first is the material used in the cable of the "space elevator".

You must know that the cable required to build a "space elevator" is almost 100,000 kilometers long, such a long cable, its weight alone is scary, and such a long cable also needs to maintain sufficient strength, so to build a cable that is both light and strong enough, even with the current human technology, it is difficult to achieve.

In fact, decades ago, when scientists proposed to build a "space elevator", the first thing they considered was the issue of cables. As a result, I can't get around this hurdle no matter what. Because according to the imagination of those scientists, the cables needed to build the "space elevator" were actually made of steel.

But this is clearly impossible. You must know that even if the length of the steel cable is more than 20 kilometers, its weight alone is enough to pull the steel cable itself off. And how heavy does a 100,000-kilometer-long steel cable have to be? 100,000 tons or 300,000 tons? Who can tow such a heavy cable into geosynchronous orbit?

So in the past, just a cable problem made the entire "space elevator" program become a flower in the water and a moon in the mirror.

However, in the nineties of the last century, people invented a new type of material, that is, the famous "carbon nanotubes". According to scientists' calculations, if the "carbon nanotubes" are made into a cable belt with a width of 1 meter and a thickness of 2 microns, then the weight of such a cable belt with a length of 100,000 kilometers will not exceed 800 tons.

In other words, with the advent of "carbon nanotube" technology, the material problem of human construction of "space elevator" cables has been preliminarily solved.

However, even if mankind has the technology of "carbon nanotubes", this technology is still immature. According to the current mastery of "carbon nanotube" technology, it is only possible to make "carbon nanotubes" into millimeter-level cables, which is far from the width of the cable required by the "space elevator".

And there is another problem that cannot be ignored, that is, the strength of "carbon nanotubes".

The strength of the cable required for the "space elevator" is at least at the TPa (1000GPa) level, and the strength of the "carbon nanotubes" is about 100GPa (the strength of ultra-high-strength steel is only 2GPa), theoretically it can only barely lift the weight of the cable, if you add the weight of the "elevator" car and a more important constraint - the wind in the atmosphere on the earth, then theoretically speaking, the "carbon nanotube" technology currently mastered by human beings is not enough to support the constructionThe heavy duty of the "space elevator" cable.

The material problem with the cables is a roadblock, and there is also a roadblock that precedes the "space elevator" program, and that is the wind from within the Earth's atmosphere!

That's right, it's the wind that can't be seen or touched!

As we all know, there is wind on the earth, and now a skyscraper hundreds of meters high can produce a swing of more than 10 meters under the action of the wind, so for a cable with a length of hundreds of kilometers exposed to the air, the wind force to withstand is tens of thousands of tons, and this force can easily drag the space elevator out of orbit.

And if the "space elevator" wants to operate safely, then the cable must remain stationary, and it must not be able to sway around with the wind in mid-air like a whip, in that case, let alone the elevator car, even if the Monkey King is moved over, I'm afraid that buddy will not be able to climb up along this cable.

Therefore, how to overcome the force brought by the high wind on the cable has become another major problem in addition to the problem of cable materials.

For the "space elevator" to be successful, the strength of the cable must be strong enough, and it must also be light enough, so that the construction of the "space elevator" can have a solid foundation. But again, to overcome the forces of the wind in the atmosphere on the cable, it is necessary to have enough engines similar to rocket engines to adjust the cable in all directions at all times.

And these rocket engines are all big guys, needless to say, the weight is naturally needless to say, so many rocket engines are loaded on the cable, how much weight does it increase? Not to mention the fuel needed for rocket engines

Therefore, these two roadblocks are like a pair of entangled lovers, entangled with each other but seriously opposed to each other, thus creating these two puzzles that scientists cannot solve.

These two problems are an unsolvable problem for scientists on Earth, but for Tang Feng, there is no problem.

The first is the material of the cable.

At present, mankind has mastered the technology of "carbon nanotubes", but this technology is not very mature. But in any case, this advanced material has been mastered by the earthlings, and what the earthlings lack is how to continue to carry forward this technology.

This is the same as controlled nuclear fusion technology, which has been achieved in the laboratory, but it is not yet possible to apply this technology to a wider level.

Therefore, in response to the problem of cable materials, Tang Feng decided to turn to Eric for help.

Anyway, Tang Feng had already decided to ask Eric for some of the technologies that the earthlings had already touched the threshold, such as controllable nuclear fusion technology, and now it doesn't matter if there is such a "carbon nanotube" technology.

As for how to overcome the wind in the earth's atmosphere, this is even simpler for Tang. For Tang Feng, who has already controlled the entire earth, it is easy to carve out a windless zone in a certain area of the earth's equator. The core can easily control the winds flowing through the area, keeping the area in a state of absolute air equilibrium.

Of course, to create this effect, Tang Feng still inevitably had to use Eric's name. After all, if you create such a windless zone on the equator, where can you believe that aliens have created a windless zone?

Aliens are technologically advanced, and creating such a windless zone is definitely not a problem (to be continued). )