<http://schema.org/alternativeHeadline>
"While the landing of the rocket was marred by rough seas, engineers were able to better control the rocket's re-entry roll, an important step in the reusable rocket process."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/space/stories/spacex-claims-milestone-with-reusable-rocket-test>