Among the many physical risks facing astronauts sent to the Moon or Mars, the biggest danger will be the least visible: radiation. This is nuclear particles that arrive at almost light speed from beyond the Solar System. The particles slice through strands of DNA, boosting the risk of cancer and other ailments. A 2001 NASA study found that at least 39 former astronauts suffered cataracts after flying in space, 36 of whom took part in high-radiation missions such as the Apollo landings.
- ①many types of space missions
- ②the danger of radiation to astronauts
- ③diverse medical problems of astronauts
- ④the effect of nuclear particles on spaceships
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정답 ②
출처: 인사혁신처 공개 기출(공공데이터포털, 이용허락 제한 없음)