<http://webisa.webdatacommons.org/161950488>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/500573804>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/161950488> .
<http://webisa.webdatacommons.org/161950488>	<http://www.w3.org/ns/prov#value>	"Astronomers have detected about 20 celestial objects that they think might contain black holes, including the center of the Milky Way galaxy." .
<http://webisa.webdatacommons.org/161950488>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<stanford.edu> .