<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/480x360/54cae45ee6a12_-_space-junk-solutions-01-0312-de.jpg>
<http://www.popularmechanics.com/space/g824/5-high-tech-space-junk-solutions/>