About: http://webisa.webdatacommons.org/172311308

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	They are also believed to occur commonly around black holes, including stellar black holes in close binary systems and supermassive black holes at the centers of some galaxies.
http://www.w3.org/ns/prov#wasQuotedFrom	daviddarling.info