<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/560/media/images/65897000/jpg/_65897500_c0111163-near-earth_asteroid,_artwork-spl.jpg>
<http://www.bbc.co.uk/news/science-environment-21459861>