<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/320x320/54caf0aee711f_-_amateur-astronomy-01-0712-de.jpg>
<http://www.popularmechanics.com/space/telescopes/g900/gear-up-backyard-stargazing-tech/>