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Scientists Warn NASA on Ethics of Space Travel

The U.S. space agency NASA plans to send humans to an asteroid and Mars, eventually. But a group of prominent U.S. scientists says right now, any deep space mission will be too dangerous, based on NASA's minimum safety requirements. And engineering capabilities and understanding of the effects of long-term cosmic radiation exposure will not advance sufficiently within the next five years to change that assessment. After a study of long-duration space travel, sponsored by NASA, the...

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