About: http://webisa.webdatacommons.org/258514322

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	A planetary nebula is an emission nebula consisting of a glowing shell of gas and plasma formed by certain types of stars when they die.
http://www.w3.org/ns/prov#wasQuotedFrom	phys.org