Shenzhou-18 was successfully launched and docked, and three astronauts Ye Guangfu, Li Cong, and Li Guangsu have entered the Chinese space station, and have joined Shenzhou-17 astronauts Tang Hongbo, Tang Shengjie, and Jiang Xinlin.
Of course, at this moment, the astronauts of the continental space station have reached the status of 6 people, and in about 5 days of mission in the same orbit, the Shenzhou 17 astronauts will return to the Dongfeng landing site.
Therefore, it is expected that the Shenzhou-18 astronauts can create new miracles on the Chinese space station and the Shenzhou-17 astronauts will make a triumphant return.
However, many people see the docking time of the spacecraft of the Chinese space station, and they also have this question, that is, why the mainland can use the 2-hour docking mode, while Shenzhou 18 has to wait 6.5 hours, what is the situation?
Let's first explain the issue of Shenzhou 18 and Shenzhou 17, and then discuss it.
Shenzhou-18 was successfully launched and docked, and Shenzhou-17 returned at 4.30
That's right, the Shenzhou-18 astronauts have started their own new journey, and the Chinese space station has formed a situation of "three cabins and three ships".
Three ships - Shenzhou 17 manned spacecraft, Shenzhou 18 manned spacecraft, Tianzhou 7 cargo spacecraft.
Three cabins - Tianhe core cabin, Wentian experimental cabin, Mengtian experimental cabin
At the same time, six astronauts simultaneously carried out tasks on the Chinese space station.
The main thing is to carry out the handover of the mission in orbit, and after the handover is completed, the Shenzhou 17 astronauts will return to the Dongfeng landing site, which is also a normal thing, but this time, the return of the Shenzhou 17 astronauts will bring significant results, which is what many people are looking forward to.
That is, during the mission, the Shenzhou 17 astronauts successfully completed the first batch of extravehicular exposure experimental material samples retrieved, the first batch of material exposure samples include non-metal and metal two categories, a total of 407 pieces, these samples were disassembled and stored by the astronauts, and will be returned to the ground with the Shenzhou spacecraft, and scientists will further carry out ground research work.
Therefore, this part of the experimental results will be the key to the mainland's scientific research on the ground, which must be expected, after all, the space experimental platform is mainly - experimental results.
Therefore, in fact, many people are happy to see that Shenzhou 18 will be the first time to "fish farming" in space on the Chinese space station.
This is an on-orbit aquatic ecology research project implemented by the mainland, with zebrafish and goldfish algae as research objects, to establish a stable operation of the space self-circulating aquatic ecosystem in orbit, and to achieve a breakthrough in the continent's cultivation of vertebrates in space.
In the future, after the experimental data is returned, the mainland can change the breeding method of these fish on the ground to realize the transformation of its growth mode, which will play a great role in promoting the development of the aquaculture industry.
Many people say that the construction of China's space station has nothing to do with the common people, and if you look at it, you should not say such a thing, which also shows that the popular science of the mainland must go deep into everyone's heart.
Of course, there is another point, the specific return time of Shenzhou 17.
According to the NOTAMS released by the Lanzhou Flight Information Region, the return capsule of the Shenzhou-17 manned spacecraft is scheduled to return to the Dongfeng landing site from 17:20 to 17:50 Beijing time on April 30.
Obviously, 2 hours of docking is faster, why does Shenzhou 18 have to wait 6.5 hours for docking?
Indeed, there are many docking methods on the mainland, such as 2 hours, 3 hours, 6.5 hours and other fast rendezvous and docking schemes, but the mainland Shenzhou 18 spacecraft uses a 6.5-hour docking mode and docks with the radial port of the Tianhe core module, why is this?
Actually, to put it simply, no matter what kind of docking mode, the mainland is "selecting the best," and if you choose different docking modes, there will definitely be different situations, and the main ones are nothing more than two points.
First, the two-hour docking is indeed fast, but it has been used on the mainland cargo spacecraft before, and on the Tianzhou-7 cargo spacecraft carried out this year, you have also seen that the three-hour docking mode adopted is not a two-hour docking, what does this mean? Each mission can take a different docking mode, and the choice is based on the actual situation, and at the same time, most of the docking modes are still in the experiment.
Second, this is the most critical thing.
As we all know, the cargo spacecraft carries all cargo materials, and the mainland must be pursuing a way that prioritizes economy and speed, and it is normal to conduct experiments on cargo spacecraft in a more advanced and faster rendezvous and docking mode.
However, it is different for manned spacecraft, which are astronauts, and the mainland must ensure absolute safety before taking the fastest docking mode, and the 6.5-hour docking mode, which the mainland has also used before, is already a fully mature technology.
Therefore, under the premise of ensuring safety, this 6.5-hour docking mode is the best.
In fact, as for safety issues, many people have also seen that the mainland has always put astronauts in the first place, and every time the Shenzhou spacecraft mission is carried out, there is also a backup spacecraft on the ground, and as long as there is an emergency, the mainland can directly and quickly launch and bring the astronauts back to the ground.
What does this mean? The safety of astronauts comes first at all times, and this is not explained. And astronauts also have a lot of preparation work before entering the Chinese space station.
Therefore, it is best and safest to adopt the docking mode of 6.5 hours, and that is definitely to be used in this way.
In the future, after the various docking modes on the mainland mature, it may take 2 hours to dock, which is only a matter of time, because China's space station will be upgraded in the future.
The Chinese space station also needs to be upgraded, bigger and more comfortable
That's right, in the future, China's space station will be upgraded, expanded, in the future we will build a 180-ton, six-module combination, the basic configuration from the "T" shape to the "ten" shape, the planned expansion module will go up to a number of fields of space science experiment cabinet and extravehicular experimental devices, expand the scale of application, to meet the new needs of space science research and application.
At the same time, it will also upgrade the facilities and equipment for astronauts' on-orbit protective exercise, diet, and hygiene, and improve the level of astronauts' work, life, and health in orbit, so that China's space station will be larger and more comfortable at that time.
The most important thing is that China's space station will gradually play an important role as a "space home port", and in the future, after the launch of spacecraft, it will not need to directly dock with China's space station, but accompany it.
That is, it is likely that more spacecraft will "fly in orbit with the Chinese space station and receive in-orbit services", docking when needed, and flying alone when they are not needed.
Therefore, such a space station, the space home port, is the ultimate goal of the mainland's development, which is worth looking forward to.
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