About: http://webisa.webdatacommons.org/198442314

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	NASA, ESA and other space agencies have done research into these topics for several years, and have worked out some theoretical approaches.
http://www.w3.org/ns/prov#wasQuotedFrom	wikipedia.org