<http://schema.org/alternativeHeadline>
"President Barack Obama views China as a potential partner for an eventual human mission to Mars. Any manned Mars spacecraft voyage would likely require international cooperation."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/space/stories/white-house-china-is-potential-partner-in-future-mars-exploration>