<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/160x160/54cad16718f10_-_backyard-astronomy-02-0911-mdn-49503694.jpg>
<http://www.popularmechanics.com/space/telescopes/g637/how-to-become-a-backyard-astronomer/>