The reserve of electrical energy is quite troublesome, and various chemical batteries have their own theoretical limits, and they can no longer be improved after reaching the upper limit. Nuclear batteries have a high ceiling, but they cannot be recharged and cannot be reused.

However, the issue of "power reserves" is very important for the safety of the spacecraft. In the vast universe, all kinds of life-sustaining equipment must be turned on at all times, so the battery is the last backup safety measure, and the larger the reserve, the better.

Until now, people have been working ultra-high-performance batteries...... Putting aside all kinds of chemical batteries, the most outstanding one at present belongs to a kind of "large superconducting flywheel battery".

This battery reserves not chemical energy, but mechanical energy!

On the surface, this flywheel battery looks like a very huge turntable with a mass of 100,000 tons!

It is located in the gravity-free zone of the Noah.

When charging, the turntable will be rotated rapidly by force; If you want to discharge, use a high-speed rotating turntable to cut the magnetic inductance wires to discharge.

Don't look at this as just a turntable, but it contains the crystallization of the wisdom of generations of technicians, which uses a large number of superconducting magnetic levitation technology. If the rotation speed of the turntable is large, because of the large mass, it can undoubtedly reserve a large amount of kinetic energy. Moreover, the efficiency of converting kinetic energy into electrical energy is very high, which can reach more than 90%.

"Could it be that a low-level civilization also has such means? The cost of a superconducting flywheel battery is not low. Yu Yifeng was a little surprised. The report was written by an authoritative scientist, so he doesn't doubt that it's an exaggeration.

He couldn't help but ask, "Has a low-level civilization also researched good things?" Also a Super Flywheel battery? ”

The female worker said with some amusement: "Don't think too much, it's a very simple device: hydro storage." During the day, they use surplus solar electricity to pump a large amount of water upstream of the reservoir and convert it into gravitational potential energy. ”

"At night, the solar panels don't generate electricity, and the reservoir opens the gates to release water, and then uses the kinetic energy from it to generate electricity...... In this way, the problem of insufficient power at night can be solved. ”

"That's the case......" Yu Yifeng was stunned, and nodded again, the method of storing energy in the reservoir is actually quite good, and it is also often used by people......

It seems that there is nothing to learn from, and he is not discouraged, but continues to read along the report.

This civilization uses solar energy on a large scale, and of course it does not naturally like to save energy and protect the environment.

It's because ...... They don't have fossil fuels anymore!

2,300 years ago, they used up almost all of their fossil fuels and uranium resources, and even the easily mined combustible ice on the seabed, so naturally there was a huge war......

Fortunately...... The Mio civilization survived the huge energy crisis, and after recovering from the war, the population has been reduced by more than half. Surviving the nuclear winter with difficulty, and then slowly developing renewable resources, until the present, a steady-state social pattern has been formed.

"The number of countries has also shrunk from a few hundred to fifty-three. There are local wars on the planet, but they are generally stable. ”

"Eventually, after the nuclear winter has passed, clean energy with solar energy as the core has replaced the original fossil energy little by little...... More than 2,000 years have passed like this, and the entire planet has once again regained its posture of green mountains and clear waters. ”

"Running out of fossil energy has become a good thing for the whole planet!"

"Interesting." Yu Yifeng smiled, this was very similar to people's previous speculations.

If a low-level civilization does not have a reasonable enough system and ideology to complete the "uncontrollable nuclear fusion" with a huge economic scale, then it ...... The large-scale use of renewable energy will be the ultimate trend of light-based civilization.

Because...... Solar energy, almost endless.

The solar energy obtained by a planet, generally speaking, is more than 10,000 times that consumed by low-level civilizations, and it can easily support the survival of these natives, but it is just a matter of convenience......

According to Earth period studies, solar energy occupies too much space, and the power generation is not stable enough, and the cost may be much higher than fossil energy. Because the energy consumption of manufacturing solar panels, through recycling, it takes 2-5 years, which is still a bit long.

Don't know about this civilization...... How to solve it?

Yu Yifeng instantly thought of several possibilities, first, reducing the quality of life, there is no way, the energy is not enough, it can only be reduced; second, to reduce the population; Third, vigorously research to improve the power generation efficiency of electric panels.

In a word...... The days can't be as moisturized as they used to be.

He casually asked, "So, they are very good at using clean energy?" ”

"Yes, after so many years of research, even low-level civilizations have made great progress, and generally 20 months can cover the energy consumption of the entire production and use cycle. And because of the energy transition, they no longer have enough strength to challenge nuclear fusion, but are going further and further in the use of solar energy......"

"This aspect should be ...... Better than us! ”

The young girl quietly stuck out her tongue, seeming a little ashamed.

As a new human being of an interstellar civilization, she is a little embarrassed that she is not as good as a low-level civilization in terms of solar energy utilization: "The photoelectric conversion efficiency of solar panels is much higher than ours...... Moreover, the conversion of various electrical energy has also reached a deeper level, and there are places worth learning. ”

Yu Yifeng smiled again and said: "This is normal, for more than 2,000 years, the continuous development of renewable energy must be more powerful than us...... In any civilization, there is something to learn from. ”

"When we carry out scientific research, we can also get a few solar panels to study by the way......"

Of course, the main task of this scientific expedition is not to steal, but to understand the culture of this indigenous civilization and collect more information. By the way, a small deep-sea scientific research base will be established to solve the problems related to microorganisms, so that people will not get sick easily.

The location of the scientific research base was chosen near the South Pole of "Mio 2", which is inaccessible and is the best place to sneak landing.

On the mission were two hundred carefully selected researchers, both men and women, including various biologists, informaticians, linguists, etc., plus twenty soldiers.

These two hundred or so pioneers are all superhumans!

The superhuman immune system and survivability are much stronger than ordinary people, which can adapt to native microorganisms more quickly, and it is also more convenient to make immunization vaccines.

After the perfect immunization vaccine is born, even ordinary people can travel to this planet.

Seeing that all the preparations were ready, Yu Yifeng walked to the front of the soldiers and said loudly: "These more than 100 biologists are our treasures and have conquered the ecosystems of several planets. There are other experts, who are also authorities in various fields, and I won't say much more, so be sure to cooperate with their instructions! Do you understand? ”

"Understood!"

"Let's go!"

……

A week later, a small country in the "Mio 2" reported an inconspicuous news: satellites in the sky observed that several meteorites, which had never been found before, fell into the Antarctic region. The meteorites made a huge splash and sank into the local ocean.

For this news, except for a few glances paid attention to by some astronomy enthusiasts, the whole incident did not make much waves.

The universe is so big, there are so many meteors, and there are almost tens of thousands of tons falling on the planet every day. A few large meteorites fell near the South Pole, and it didn't seem to be a big deal.

And in a place like Antarctica, there is sea everywhere, and there is not much economic value. More than 2,000 years ago, the massive use of fossil fuels caused a huge greenhouse effect, melting glaciers and devastating the ecosystem.

It wasn't until the later nuclear winter that the thick ice condensed back again.

But after such repetition, Antarctica no longer has much scientific value.

Moreover...... The light here is very weak, and there is no power generation value, and the combustible ice has been dug up, except for a few glaciers, plus the vast expanse of seawater.

So no one really plans to go out into the ocean and spend a lot of effort catching meteorites......

However, a few days later, a quiet dark blue submarine emerged from the surface of the sea...... It is almost the same color as the sea, and it is sailing at a speed of 60 kilometers per hour.

Several figures poked out of the submarine, and the first one was none other than Zhao Yao, the captain of the soldiers!