About: http://webisa.webdatacommons.org/117557759

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	When two dense objects such as neutron stars or black holes orbit each other, space-time is stirred by their motion and gravitational energy ripples throughout the universe in a manner represented by the picture at lower right.
http://www.w3.org/ns/prov#wasQuotedFrom	mit.edu