원문출처 : http://www.cnn.com/2016/10/11/opinions/america-will-take-giant-leap-to-mars-barack-obama/index.html
2016.10.13 00:05
Obama: 20-year race to Mars
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원문출처 : http://www.cnn.com/2016/10/11/opinions/america-will-take-giant-leap-to-mars-barack-obama/index.html
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