<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/ws/560/amz/worldservice/live/assets/images/2016/01/20/160120170735_planeta_nove_2_vale_640x360_caltechir.hurt_nocredit.jpg>
<http://www.bbc.com/portuguese/noticias/2016/01/160119_descoberta_nono_planeta_rb>