<http://schema.org/url>
<http://www.businessweek.com/articles/2014-04-11/hubble-madness-picks-a-winning-image-and-deep-space-never-looked-so-good>
<http://www.bloomberg.com/bw/articles/2014-04-11/hubble-madness-picks-a-winning-image-and-deep-space-never-looked-so-good>