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Alien Earth: What it will mean to find our planet's twin - CBS News - CBS News
URL: http://www.cbsnews.com/8301-205_162-57563027/alien-earth-what-it-will-mean-to-find-our-planets-twin/
Submitted: Fri Jan 11 2013
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CT: UFOSeek News 2013: Alien Earth: What it will mean to find our planet's twin - CBS News - CBS News
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Alien Earth: What it will mean to find our planet's twin - CBS News