<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/320x240/54caecc8ba797_-_milky-way-08-0512-de.jpg>
<http://www.popularmechanics.com/space/deep-space/g850/a-visitors-guide-to-the-milky-way/>