At this afternoon's "Tiangong Classroom", the "space teachers" on the Chinese space station answered the curious questions of the students in the ground classroom.
Guangxi Session: How is oxygen and carbon dioxide circulated on the space station?
Ye Guangfu: Our space station uses an electrolytic oxygen production subsystem to produce the oxygen needed for human breathing by electrolysis of water, and the carbon dioxide produced by astronauts' breathing is removed by carbon dioxide removal oil, which reduces the carbon dioxide content in our cabin.
Subsequently, our space station will also be equipped with a carbon dioxide reduction subsystem, which can react with the hydrogen produced by the electrolyte oxygen and the carbon dioxide produced by the human body to produce water, which can greatly improve the material circulation ability of our space station.
Macau Breakout: Can you play games online, watch videos, and send emails when you are bored in space?
If so, can we email you? Is it possible to watch televised broadcasts around the world in real time, just like on the ground?
Ye Guangfu: At present, we can send emails to the ground in the core cabin, and we can also video. Usually we can watch novels, watch movies, we can also listen to music, every night we can also watch TV, and the channels are very rich.
Every weekend off, we can also have two-way video calls with our families, but because our email communication with the ground needs special processing, we can't receive emails from our classmates for the time being. If you have any ideas, you can leave us a message online.
Sichuan Branch: How is the scenery you see in space different from that on Earth? Do the stars blink their eyes in a flash? Are there any UFOs around? Is the sky still as valiant as earth is?
Wang Yaping: Through the hanging window, we can see our blue earth, and the sun, moon and stars, but so far I haven't seen UFOs.
Since we are outside the atmosphere, without the interference of the atmosphere, the stars we see will be exceptionally bright, but they will not blink.
In addition, without the scattering of the atmosphere, the sky we see is not blue, but a deep black.
Also, I'm going to tell you a wonderful phenomenon that we can now see 16 sunrises a day because every 90 minutes we can make the earth circle.
Beijing: When you rush out and return to Earth in a spaceship, are you as exciting as we are riding a roller coaster? What are some of your wonderful experiences along the way?
Zhai Zhigang: Flying a boat is more exciting than doing a roller coaster, because the load generated by the spacecraft in the process of rushing out of the earth and returning to the earth is much greater than that of the roller coaster.
What is it like to be in a spaceship? I suggest that children have the opportunity to go to the centrifuge once, and after sitting, you will know this very magical feeling.
Beijing: Do you float around when you sleep in space? Can you dream? Is there a difference between the dreams and the dreams on earth?
Wang Yaping: Everyone sees that we usually float around when we work, but in order to prevent bumps and ensure safety when sleeping, we have fixed sleeping bags in our sleeping area, and when we sleep, we have to drill into the sleeping bags and tie ourselves up to prevent them from drifting away. However, due to being in a weightless environment, no matter what kind of posture you sleep, you have a feeling of sleeping standing up.
Sleeping in outer space, I often dream, sometimes dreaming of being with family and friends, sometimes dreaming of all kinds of interesting things.
Unlike on Earth, every time I wake up, I feel very special, because whenever I open my eyes and see myself suspended in my sleeping bag, I have a feeling of dreaming at this time.
Author: Xu Qimin
Image: Screenshot of CCTV live broadcast