<http://schema.org/alternativeHeadline>
"NASA has compiled the first-ever list of minerals found on another planet after the Curiosity rover found soil on the Red Planet similar to the volcanic sand found in Hawaii."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/space/videos/minerals-similar-to-earth-found-on-mars>