According to foreign media reports, NASA wants to send humans to Mars. In order to achieve this task, many technologies have been put in place. In order to realize the manned trip to Mars in the 265438+30' s, other important systems can be developed in time, but this process will be very long, because there is still a very important question that has not been answered-how will the human body react?
Scientist have been studying that effect of space travel on human body for some time. At present, it is known that the short-term impact of weightlessness is very small, but the long-term change has not been completely understood. Now, a new study shows that people still have a lot to learn and understand, and spending a lot of time in space will have a strange effect on blood flow.
The latest paper published in JAMA studies the blood circulation changes of 1 1 space travelers who have lived in the International Space Station. As a result, the researchers found that their blood flow was completely normal when they left the earth, but on the 50 th day of their entry into space, dramatic changes had begun.
Among them, the changes of blood circulation through the head and brain have aroused some deep concern. Among the seven space travelers, the blood flow from the head to other parts of the body showed signs of stagnation, and even reversed in some cases.
As we know, on the earth, gravity helps blood to drain from the head, and at the same time ensures the stable flow of blood. However, in space, this kind of help does not exist, and slow or stagnant blood will lead to blood coagulation. In fact, two astronauts were found to have thrombosis or partial thrombosis in the left internal jugular vein. It is very dangerous to have blood clots in the human body. If a blood clot forms and then enters the lungs, it may cause pulmonary embolism, which is a potentially fatal disease and needs immediate treatment.
Research shows that people on the earth spend about two-thirds of their time upright, and the rest 1/3 is supine. In ISS, because astronauts live in weightlessness, their body fluids will be continuously redistributed to their heads without being affected by the changes of hydrostatic pressure caused by daily postures.
This is already a potentially serious problem for travelers to the International Space Station. Obviously, going to Mars is a more dangerous proposal. Even according to the most optimistic flight time estimate, astronauts going to Mars will spend more than 400 days in space, and they will spend nine months floating in weightlessness at both ends of the journey.
Although the artificial gravity system can provide a solution, this technology is still in its infancy. This situation may change in the future, but it is obvious that people still need a solution before considering a manned trip to Mars.
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