the human yearning for a long time for the vast expanse of space. From the myth of chang e to is also true of the journey to the west, people describe the space as a wonderful fairy world. In people's imagination, the space is a perfect paradise of the United States. In the real world, however, the space is not as romantic as people imagine. Into space, is the danger of human face rather than the fairyland. The problem of manned space flight is far more than just "lonely at the top".
the first manned flight to overcome the difficulties is vacuum environment effects on people. If there is no air in space, the human body naked in a vacuum, will not be able to breathe. If the astronaut's cockpit, habitats once leakage gas, is likely to cause death.
to overcome the second difficulty is the impact of intense radiation from space, this space radiation including electromagnetic radiation, the sun radiation and high energy particles. Solar electromagnetic radiation in the visible and infrared parts mainly influences the temperature of the spacecraft, can damage some of spacecraft surface material, also influence the temperature and the density of the upper atmosphere, thus the burden of aggravating Leo spacecraft orbit control. High-energy particle radiation has direct influence on the spacecraft themselves. High-energy particles moving around the earth for a long time, in low orbit spacecraft pose a serious threat. The radiation of spacecraft surface material not only, and will make the inside of the spacecraft solar cells, organic material, the performance of semiconductor devices and integrated circuits such as changing, even cause permanent damage.
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