In a few days, the three Shenzhou 13 astronauts will return to the embrace of the motherland, and have now entered the preparation stage of return, such as cleaning up the garbage collection station on the International Space Station - Tianzhou 2, for example, in order to better adapt to the ground gravity environment, the astronauts have strengthened physical exercise, no less than 2 and a half hours a day.
The countdown clock for the return of the Shenzhou 13 astronauts has been started, and it is inferred that Tianzhou 4 and Shenzhou 14 are also about to be launched, and the launch of Tianzhou 4 is to transport materials in advance, including astronauts' living materials, refueling, operating tools and scientific instruments.
The list of Shenzhou 14 astronauts has also been determined, and it is still in the stage of secrecy, and it is not until a few hours before the launch that we will meet with everyone, mainly for the sake of safety, even if it is close to the launch time, the astronauts are still undergoing strict training and medical testing, whether the blood pressure is normal, whether the heart rate is correct, and whether the mood is normal.
Like Shenzhou 12, the Shenzhou 13 return capsule also landed in the Dongfeng landing field, the mainland's spacecraft landing field mainly has two, one is the Siziwangqi landing field, the other is the Dongfeng landing field, why did the astronauts of Shenzhou 12 and Shenzhou 13 land on the Dongfeng landing field? There must be something to consider.
Shenzhou 13 astronauts Zhai Zhigang, Wang Yaping and Ye Guangfu entered the Chinese space station on October 16, 2021, and will return to the ground after staying for 6 months, and the return time is determined to be in mid-April, taking the Shenzhou 13 return capsule to land on the Dongfeng landing field, at that time, we can see the space heroes returning from the triumph of space.
Almost 6 months, what did the 3 astronauts do? 1, there have been two outgoing activities, raised the height of the camera, expanded the field of view of the camera, installed a cascade device of the large and small robotic arm, increased the crawling distance of the robotic arm, some people say that it is quite open to the Chinese space station "Ren Dou second pulse".
2, gave us two wonderful "Tiangong Classroom", the main teacher Wang Yaping vividly and interestingly introduced vivid and interesting scientific experiments, such as the magical space water polo experiment, microgravity environment experiment, space turn experiment, space projectile experiment, space "ice and snow" experiment, and water and oil separation experiment.
3, Shenzhou 13 astronauts on the basis of Shenzhou 12 astronaut scientific experiments, completed more than 20 space science experiments, especially in life science research has made great achievements.
A cell model and long-term culture system under space conditions were established, and a number of world-leading experiments were completed according to the cell model and culture system, for example, the "calcium signal flicker" of cardiomyocytes in space was observed for the first time, the beautiful contraction process of cardiomyocytes, and the first skin stem cell weightless suspension culture experiment was completed.
These scientific experiments have enriched China's space experiment programs, and they must have played a certain role in promoting the progress of China's space science cause, which is really great, China has become strong because of them, and this time they are really full of loads.
Why did Shenzhou 12 and Shenzhou 13 both land on the Dongfeng landing field?
1, the area is very large and empty, the area of the Siziwangqi landing field is only more than 2,000 square kilometers, but the Dongfeng landing field area has reached more than 20,000 square kilometers, 190 kilometers long from north to south, 120 kilometers wide from east to west, and the area is 10 times that of the Siziwangqi landing field.
According to people's habitual thinking, there is no special reason, generally will choose a large area of landing field, large area allows large landing point error, the so-called "lost millimeter, fallacious thousand miles", although the return capsule every time accurately touch the predetermined point, but in case of other factors affected by the deviation from the predetermined point, the large area has a strong buffering ability.
2, Dongfeng landing field is more sparsely populated, Dongfeng landing field is located in the Badain Jaran Desert and Gobi Belt, the terrain is diverse, there are deserts, Gobi and mountains, the focus is sparsely populated, the Four Sons Wangqi landing field although the population is also relatively sparse, but still can not be compared with the Dongfeng landing field, which is also for people's safety.
3, dongfeng landing site is full of desert, Gobi, mountainous land, with low maintenance costs, convenient search and rescue, favorable treatment, stable weather, strong logistics support capabilities, does not affect the local economy and other characteristics.
The Shenzhou 13 mission is the final technical test of the Chinese space station, such as the test of the energy system, the life system, the scientific experiment system, etc., the return of the Shenzhou 13 astronauts, which means that the technical test phase of the Chinese space station is over, and it has entered the large-scale construction stage, and there will be 6 space launches, 2 cargo launches, 2 manned launches, and two experimental module launches in 2022.
There are already 18 countries that have joined the Chinese space station project, it is said that as early as 2020, ESA astronauts came to the Chinese training center to learn Chinese, and now they can speak fluent Chinese, so will the Shenzhou 14 and Shenzhou 15 astronauts have foreign astronauts to join? This should be a very unlikely thing.
The reasons are as follows: 1, the mainland has enough astronauts, and there are 16 extremely experienced astronauts alone, including Yang Liwei, and there is no shortage of astronauts at all. 2, the construction of the Chinese space station is very important, there is no room for negligence, such an important task must be handed over to more experienced Chinese astronauts. Interesting and informative scientific content, please pay attention to the only WeChat public account: Interesting Exploration