<http://schema.org/alternativeHeadline>
"The rover has covered just over 24 miles in its time on Mars, and with continued good luck, it could keep on researching the Martian surface for a while longer."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/space/stories/nasas-opportunity-celebrating-a-decade-of-exploration-on-mars>