<http://schema.org/mainEntityOfPage>
<http://www.popularmechanics.com/space/moon-mars/a9953/nasa-discovers-mystery-martian-rock-near-rover-16391957/True>
<http://www.popularmechanics.com/space/moon-mars/a9953/nasa-discovers-mystery-martian-rock-near-rover-16391957/>