<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef-1.bbci.co.uk/news/560/media/images/71694000/jpg/_71694806_r3840042-europa,_galileo_images-spl.jpg>
<http://www.bbc.com/news/science-environment-25349395>