<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/480x360/54caecc93a004_-_milky-way-09-0512-lgn.jpg>
<http://www.popularmechanics.com/space/deep-space/g850/a-visitors-guide-to-the-milky-way/>