About: http://webisa.webdatacommons.org/146893169

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	The one depends purely on the presence of hydrogen at suitable temperatures and density; the other depends, in addition, on the presence of atoms of heavier elements, in particular of carbon and nitrogen.
http://www.w3.org/ns/prov#wasQuotedFrom	st-and.ac.uk