About: http://webisa.webdatacommons.org/217412704

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	However, one of the biggest obstacles to building a space elevator is space debris: defunct satellites, fragments of rockets, and any unused object originally built and launched by humans that is no longer used.
http://www.w3.org/ns/prov#wasQuotedFrom	phys.org