PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • t stars formed, when the universe consisted mostly of neutral hydrogen and helium.The fine-structure constant characterizes the strength of the electromagnetic force, which is one of the four fundamental forces in physics.
http://www.w3.org/ns/prov#wasQuotedFrom
  • astronomy.com