U.S. found that human immunity is declining under weightlessness

Release date: 2007-12-14

The United States found that human immunity declined in the state of weightlessness. At the beginning of 2004, US President George W. Bush proposed the future human space exploration program of the United States. The goal is to complete the International Space Station in 2010 and return the US astronauts to the moon by 2020. The possibility of human beings landing on Mars and beyond. To achieve the plan, NASA set specific steps and began designing and building new moon launchers and spacecraft to study the challenges that astronauts may face during a round trip to Mars.
In this plan, scientists believe that the most critical issue for astronauts to achieve long-term space travel is whether humans can return to Earth without any damage.
In past studies, scientists were primarily concerned with whether astronauts in spacecraft would suffer from cosmic and solar radiation during space travel, and whether their bone strength would decrease and muscles would be out of tune under weightlessness. However, a recent study by scientists found that the toxicity of Salmonella increased under weightlessness, which undoubtedly raised concerns about Salmonella and other bacteria that might produce the same results in space, because they directly threatened aerospace during travel. The health of the staff.
On December 10th, the US "Washington Post" published an article saying that interstellar astronauts will face another greater threat, that is, their body's immunity will weaken in space, which will make them more vulnerable to lurking in Bacterial and viral infections in or around the body. This news surprised many people who support manned space flight, because astronauts' decreased immunity and increased bacterial attack potential may make human interstellar travel a dream that is hard to come by.
According to reports, the new study was based on Hughes Fulford. Fulford was an astronaut and is currently studying the effects of microgravity on human immunity with the support of NASA. She said that for astronauts who are preparing for long-distance travel in the future and living on the moon, immunity may be a potential big problem for them. Based on his own research, Fulford believes that weightlessness is the main cause of the decline in astronaut immunity. She said: "Human evolution has evolved in the gravitational field, so there is no doubt that certain systems of the human body, especially the immune and skeletal systems, are likely to be abnormal in the absence of a gravitational field."
In fact, more than 30 years ago, NASA learned in the Apollo mission to the moon that the astronaut's immune system had been temporarily inactive in space. According to records, three members of a flight group had a cold at the same time. In addition, a crew member of Apollo 13 developed severe chills due to infection with certain bacteria. Usually, only when the immune system is inhibited, the human body will cause a disease by infecting the bacteria. Therefore, in the later stages of the implementation of the Apollo program, in order to ensure the health of astronauts, managers took measures to isolate astronauts before launch to ensure they were kept away from bacteria.
Scientists believe that for astronauts working in space for a short period of time, the decline in immunity will not cause serious physical health problems, because their own physical quality and people's disinfection of their space living environment will protect them from infected. However, for astronauts who have been doing interstellar travel for a long time, including astronauts who have worked on the station for a long time, people must find a better way to protect them.
To understand the causes and mechanisms of the decline in immunity of astronauts in space, Fulford conducted research on human blood cells that had been sent into space. She found that in the weightless state, some genes that can open and close the immune system on the ground did not work properly, which caused the body to fail to initiate some important anti-infective capabilities. In addition, Deborah Kimbour, a scientist at the University of California, is conducting research on fruit flies under the auspices of NASA. Although the study has not yet completely ended, preliminary results show that the fruit fly lost some of its ability to fight infection after traveling through space. Like Fulford, Kimbriel also believes that weightlessness itself plays a very important role in the abnormal process of the immune system.
In addition to the above factors that may affect human interstellar travel, Dr. James Lewis of the Center for Strategic and International Studies said that interstellar astronauts may also have psychological problems. Astronauts working on the International Space Station may still not be able to Complete the travel mission to and from Mars. Because on the space station, astronauts can see the earth through the window, and still maintain a corresponding relationship with human life; but in the 6-month interplanetary journey of manned Mars, the astronauts can only be like Magellan Global. Drifting infinitely, the psychological condition is unpredictable.
Dr. James Lewis of the Center for Strategic and International Studies of the United States said that the US space exploration program is divided into two categories: unmanned detection and manned detection. In comparison, he personally supports the unmanned detection program. In the past few decades, the United States has achieved remarkable achievements in unmanned space exploration, such as the "Traveler" detector arrived at the edge of the solar system and the robot boarded Mars. In terms of manned space flight, although American astronauts have successfully landed on the moon, people still do not have the conditions for deep space travel. Many problems remain unknown. He believes that interstellar astronauts may also have psychological problems, and astronauts working on the International Space Station may not be able to complete the mission to and from Mars. Because on the space station, astronauts can see the earth through the window, and still maintain a corresponding relationship with human life. However, in the process of manned Mars exploration, in the 6-month interplanetary travel, the astronauts can only drift like the Magellan Global, and their psychological situation is unpredictable. ——China Medicine 123 Network

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