원문출처 : http://edition.cnn.com/2015/02/11/opinion/opinion-space-isolation-challenge/index.html?eref=edition
2015.02.13 03:05
How will space explorers cope with isolation?
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원문출처 : http://edition.cnn.com/2015/02/11/opinion/opinion-space-isolation-challenge/index.html?eref=edition
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