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Ancient astronomers examined the night sky hoping to learn more about the universe. Because it, scientists have researched what conditions are like beyond Earth’s atmosphere, and what effects space travel has on the human body. Many experience physiological and psychological problems when they return to Earth. Some of these ailments are short-lived; others may be long-lasting.
In the gravity-free environment, the body cannot distinguish up from down. Throughout the duration of a mission, astronauts’ bodies experience some potentially dangerous disorders. For example, bone density can decrease at a rate of 1 to 2 percent a month and, as a result, many astronauts are unable to walk properly for a few days upon their return to earth. Exposure to radiation is another serious hazard that astronauts face. Without the earth’s atmosphere to protect them, astronauts can be exposed to intense radiation from the sum.
Well, astronauts who travel for extended periods may also suffer from psychological stress. In addition, long periods away from family and friends can leave space travelers feeling lonely and depressed. But, some of the physical and mental challenges of space travel can be controlled with diet and regular exercise. However, we may one day see humans walk on distant planets.
悲哀的英文報告又輪到我了．．一個月過去了，真快啊．． 一 一
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