About: http://webisa.webdatacommons.org/114825224

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	Dark matter is thought to constitute almost 27 percent of the universe's total mass and energy, but its nature is a mystery.
http://www.w3.org/ns/prov#wasQuotedFrom	fnal.gov