About: http://webisa.webdatacommons.org/165403490

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	If you have a body like earth (not hollow sphere) and you dug a tunnel like in ethan???s example, and we disregard everything else except gravity.
http://www.w3.org/ns/prov#wasQuotedFrom	scienceblogs.com