In the half century since the end of the first manned mission to the moon, mankind's scientific and technological development has been very rapid.

However, compared with the rapid development of Internet technology, the progress of space technology does not seem to be as great as previously imagined, and it is not until later that people realize that the future of mankind is not on the earth, but still in space, and mankind once again attaches importance to the development of space technology.

Today's human beings are not only planning to return to the moon and land on Mars, but also planning to build a "space base" on the moon and use the moon as a "springboard" to other planets in the future.

It's not just one country, several countries' space agencies, and even private space companies, have similar plans.

It wasn't the time before, but now, it's the right time.

Not to mention that there are four living aliens hooking up with people on Mars every day.

It's just that many plans seem to be beautiful, but leaving the Earth to live on the moon is not an easy task.

The moon is not as habitable as the earth, and because the moon has no atmosphere and magnetic field, the radiation on the surface of the moon is very terrible, so if you want to immigrate to the moon, you must first get the lunar radiation, otherwise it is tantamount to "moths to fire".

Where does the lunar radiation come from?

In fact, we are in radiation all the time on the earth, but because the earth has a magnetic field and atmosphere, most of the space radiation is isolated, so that the earth's climate and environment will become more comfortable and safe.

However, in addition to the earth, it is difficult to say about other terrestrial planets, but beyond that, the cosmic environment is generally very terrifying, because the universe is flooded with all kinds of super radiation all the time.

Take the solar system as an example, all kinds of radiation in the solar system mainly come from various energies released by solar activity, the most terrible of which is solar storms.

Even on Earth, when the solar storm is very strong, the ground will be disturbed, and the slightly more fragile communication system will be able to give you a boost in no time.

So the radiation on the moon next to the Earth is also associated with solar storms.

Because the Moon is in a vacuum and is very close to the Sun, solar storms on the Moon are much more terrifying than those on Earth.

After about one year of lunar surface radiation exploration, Tianxia's Chang'e-4 probe found that the space radiation on the moon is 200 times that of the earth.

Astronauts wear thick extravehicular spacesuits when they are in low-Earth orbit, let alone on the moon.

These extravehicular spacesuits are not ordinary fabrics, they are carefully designed protective clothing, mainly to protect astronauts, used to isolate space radiation.

Even so, after the Merrican astronauts who landed on the moon returned to Earth, they found that the huge amount of radiation still caused a lot of irreversible damage to their bodies.

Therefore, if you want to build a space base on the moon, you must first find a way to deal with the super radiation on the moon, otherwise everything is empty talk.

At first, there was nothing to do, but later scientists discovered that there are many lava tubes under the moon, which can be used to build human bases, and because they are under the surface of the moon, they can help humans isolate most of the lunar radiation.

If you can't find a suitable lava tube, you can do the other cliffs, canyons, or caves, as long as you can avoid the solar wind sweeping directly over the human base.

If it is really not suitable, for example, if you find a place to "block the wind", but the location of that place is not good, there is not enough solar energy, or there is enough solar energy, but there is not enough water resources, then you can only "artificial" cliffs and canyons to "block the wind" in a place where there is enough solar energy and water resources.

At the same time, researchers also pointed out that even if the space base built by humans on the moon is safe, it can only live on it for about 6 months at most, otherwise the amount of radiation that the human body will still bear will exceed the standard.

Radiation sickness increases the risk of cancer in all parts of the body.

When the body's cells and DNA are killed and destroyed by radiation, it is almost impossible to return to health.

It can't be helped, after all, the moon is not the earth, it has no magnetic field and atmospheric protection, and the human body is also ...... It is indeed not suitable for survival in space.

The manned lunar landing of Tianxia and the Navigator cooperation this time, as well as the plan for permanent residence in the future, is to use the method of "artificial lunar soil protective layer" in places with sufficient energy and water resources to improve the radiation protection capability of the base.

The artificial lunar soil protective layer is not only the sandbag method they used this time, there are still many ways to use it, but they have tricked it this time.

Other companies focus sunlight or spontaneous light to sinter lunar soil, then form lunar bricks or regular lunar soil stones, and then use them to build protective walls around the perimeter of the shelter.

It's just that this process takes too long, and it takes 5 hours to make a brick.

And the strength of this brick is only one-fifth that of concrete, which can be compared with ...... Plaster is comparable.

There are also those that are not sintered into bricks, but directly glued to the lunar soil with some kind of adhesive, and then built a shelter with an automatic robot like an ant nesting.

However, the process of this method is still too long, not because the gluing time is long, but because the automatic robot is too slow.

At the same time, the adhesive also needs a lot of water, and the water problem needs to be solved.

Compared to these plans, sandbags are definitely the simplest and crudest way to do it.

The four astronauts entered the cargo compartment of the Moon Palace-2 and took out shovels and sandbags made of special materials.

This kind of sandbag is not an ordinary sandbag, its basic material has very good toughness, not only has a certain protective effect on micrometeorite attacks, but also has some resistance to space radiation, plus it is filled with lunar soil, the effect of resistance to impact and radiation is even higher.

The flexible joints of the rigid spacesuit can ensure the efficiency of the four astronauts, and the simulated lunar training in the mirage space can make them adapt to the gravity of the moon so much that they will not deform too much when doing movements.

They worked in pairs, one holding a pocket and the other carrying a shovel to fill it with earth.

After filling a bag, the zipper of the bag mouth is pulled to complete the sealing.

After the sealing was completed, they were not in a hurry to transport it, but threw it aside, and when they had gathered enough ten or twenty bags, they transported it to the second of the Moon Palace and stacked it according to the plan.

The ones who had planned to make a brick in five hours, they had already stacked the sandbags in five hours.

After five hours, their first work on the moon was over, and it was time to rest and eat, after which they were to modify the lunar rover a little and then go in search of water.

Although they are well supplied for three months and do not need to drink the water of the moon for the time being, the water on the moon is not just for drinking.

Water on the moon is everything.

Water on the moon is "oil", which can "refuel" humans, plants, and spacecraft.

Not to mention the first two uses, just mining ice for electrolysis to obtain fuel, and then providing fuel to the spacecraft is the use of lunar water that mankind dreams of.

The Moon's low gravity means that the conditions for entering orbit are extremely low, so it is cheaper to resupply long-distance space travel vehicles from the Moon than on Earth.

For example, if you refuel once on the moon, the cost is only one-fiftieth of what it is to refuel on Earth.

In the future, the "reusable" ability of spacecraft will become the standard, and the majority of the cost of launch will be maintenance and fuel, and if the fuel cost is reduced to one-fiftieth, it will be a subversive impact.