Word: minima
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Dates: during 1960-1969
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...particles deep into space. The chance of such an event occuring during a one-week lunar journey in 1969 will probably be about one to three, odds on which the U.S. has neither the right nor the wish to risk men's lives. Thus 1975 and 1986, both solar minima and free from dangerous radiation showers, may be suggested as more reasonable dates for a lunar expedition...