About: http://webisa.webdatacommons.org/366956085

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	In 1932, Estonian astronomer Ernst ???pik suggested that long-period comets, such as Hale-Bopp, may originate from the Oort cloud and this idea was extended by Dutch astronomer Jan Oort in 1950.
http://www.w3.org/ns/prov#wasQuotedFrom	thestargarden.co.uk