About: http://webisa.webdatacommons.org/285067930

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	By comparing these, they would know that one observer is moving relative to universe and other is not, so the question of who is moving would not be totally relative anymore?
http://www.w3.org/ns/prov#wasQuotedFrom	physicsforums.com