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"Although 0.3G of simulated gravity is much smaller than Earth's, it's incredibly precious in space. We'll be showing you a series of somewhat imprecise comparison experiments to help you understand the importance of gravity in space!"

Yesterday, after the Tiangong Space Station docked with the New Sky Inn, the astronauts from both sides gathered to greet the audience and then ended the livestream.

The audience was, of course, not satisfied. Not only were they unsatisfied, but those who found out about it later were also unhappy. At least the others saw the livestream; they didn't even see the livestream and could only find recordings online.

After watching it, they were incredibly shocked.

The scenes from science fiction movies had actually become reality!

There hadn't been any news about it beforehand.

Those who watched the livestream yesterday at least had the benefit of guessing through the comments, and some guessed correctly, which was like having a "spoiler alert." But those watching the recordings were directly confronted with the "science fiction future."

When many people discussed it online, they also tagged Pathfinder and the official Tianxia Aerospace Administration, asking the officials to release more related videos for their friends who loved to watch them.

So, on the second day after docking, the Aerospace Administration and Pathfinder jointly released a video.

In the video, five astronauts from two different space stations went to each other's space stations in groups of one or two to experience the different environments.

Two astronauts from Tiangong came to Pathfinder, and they, along with one remaining Pathfinder astronaut, experienced the simulated gravity chamber. They experienced running, exercising, eating, working, resting, and using the toilet under 0.3G gravity. The simulated gravity chamber had four sections, each with different functions, so that rest, exercise, and work didn't interfere with each other.

The Pathfinder trainee astronaut hadn't been up there for long and didn't feel it as deeply, but the Tiangong astronauts, who had been in space for several months, were really about to cry with emotion.

Speaking of crying, before, in the completely weightless environment of the Tiangong Space Station, they would try their best to stop themselves from crying because when you cry, your tears don't flow down. They just gather around your eyes and accumulate, eventually turning into a water ball.

If you don't use absorbent cotton to soak up the tears in time, your eyes might be damaged.

Now they could cry, cry tears of happiness, because experiencing gravity again in space was just too good.

When running on the treadmill, they didn't need to be tethered. As long as their movements were standard, they could run just like on Earth, just with a slight floating sensation.

They could lie down to sleep, feel the softness of the mattress, and cover themselves with a thin blanket, without having to find a sleeping bag to tie themselves up.

The simulated gravity chamber's restroom was truly amazing. Although it still had some space-like features, compared to washing up in a weightless state, the simulated gravity chamber's restroom was "heaven."

When eating, they could sit steadily, without worrying about floating away while eating, or worrying about food scraps flying everywhere, even into your throat, causing you to cough non-stop.

The feeling of holding a bowl and drinking soup was really nice, giving them a sense of coming home.

It is said that Pathfinder is working on the technology of separating and reusing oily fumes. If this technology is developed, then they can stir-fry and cook in the simulated gravity chamber of the space station.

Of course, they can do it now, but when they don't have the technology to separate oily fumes, all the oily fumes generated by cooking have to be completely replaced, which is too wasteful.

There are so many things that 0.3G of gravity can do. It's almost twice the gravity of the moon. Before, they envied their colleagues in the lunar base for being able to sit and eat steadily. They didn't expect that now they could too.

And even better.

These obvious benefits are not the most important. The implicit benefits are the core motivation for developing the simulated gravity chamber.

As we all know, space travel can explore the unknown, experience adventure and excitement, and satisfy humanity's desire for novelty.

But this is only limited to short-term space travel.

Practice has proven that long-term spaceflight in weightless and vacuum environments can cause serious damage to astronauts' bodies, such as muscle atrophy or cancer.

Currently, the longest time astronauts have stayed in space is more than 400 days. In future space exploration, the time spent in space will become longer and longer, so it is necessary to understand how the space environment of weightlessness, high vacuum, large temperature fluctuations, and high-energy radiation affects human health, and to overcome them one by one.

Weightlessness can cause changes in cardiovascular function. As mentioned before, it will make your face big and your neck thick.

This is because during spaceflight, the astronaut's blood and other body fluids do not flow down to the lower body as usual under gravity. Instead, the blood from the lower body flows back to the chest and head, which can cause facial swelling, head distension, varicose veins in the neck, headaches, nasal congestion, and the body's center of mass shifting upward.

In the first few days, astronauts may also suffer from motion sickness, also known as space motion sickness. It is similar to any other form of travel sickness, which refers to excessive stimulation of the inner ear's vestibular balance receptors when riding in a vehicle.

At this time, the vestibular organs will produce excessive bioelectricity, which will then affect the nerve center, and finally cause symptoms such as cold sweats, nausea, vomiting, and dizziness, accompanied by stomach discomfort and vomiting.

If you vomit in the space station, or even directly in your helmet, that scene is really exciting.

On Earth, medication can be taken to alleviate the symptoms of motion sickness, but on the space station, astronauts cannot use medication even if it causes more serious space motion sickness, because the space environment can cause all kinds of situations. Even if it is necessary to use it, it must be a special drug developed for space conditions.

After staying in space for three months, some astronauts will experience muscle atrophy and may even lose up to 30% of their muscle mass. They need several months to recover to normal after returning to Earth.

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In addition, spaceflight will increase the risk of bacterial or viral infections and may even reactivate certain latent viruses in the astronaut's body.

When astronauts return to Earth, their immune systems have undergone great changes, and months of space life have caused them to lose 8%-12% of their bone density, which may take up to three years to recover.

In addition, other health factors of space travel include psychological stress, disruption of the circadian rhythm, extreme temperatures, and environmental noise, which may lead to hearing loss, lack of concentration, sleep disruption, and susceptibility to fatigue.

Most of these problems are caused by the weightless environment. As long as astronauts regain gravity, these situations will be reduced to some extent.

However, everything has two sides. In a zero-gravity state, there are naturally both disadvantages and advantages.

For example, some situations that are unfavorable to normal people can, conversely, alleviate back pain and improve blood circulation in some patients.

Therefore, the current model of the Tiangong and Star Inn combination is both a weightless environment and a simulated gravity environment.

In addition to weightlessness, there is also equally dangerous high-energy radiation.

When astronauts leave the ground, they also leave the thickest atmosphere and magnetic field protection. The atmospheric molecules in space orbit are already very thin.

Without the protection of the atmosphere and part of the magnetic field, high-energy radiation will have a dangerous effect on the human body. After all, the thin protective layer of the space station is certainly not as good as the hundred-kilometer-thick atmosphere.

High-energy radiation in Earth orbit comes from galactic cosmic rays and solar flares. Long-term exposure to high-energy radiation can kill cells and damage DNA, which may lead to an increased risk of cancer and cataracts.

In fact, Pathfinder has almost one new technology per day. The wall protection layer of the simulated gravity orbital cabin is Pathfinder's new material. The protection ability of the new material is several times better than the protection materials of Tiangong and the International Space Station.

In addition, Pathfinder's life science research department has various new drugs, especially drugs for space radiation damage and enhancing human physique, which are also at the world's most advanced level.

With several technologies working together, it is enough to ensure that astronauts have a better chance of survival in space.

But those are too far away. Just the current performance of simulated gravity has already made many people ecstatic.