About: http://webisa.webdatacommons.org/276899496

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	These spacecraft do not have sufficient radiation hardening, volume, and other systems needed to operate beyond earth orbit or even serve as reliable direct return vehicles from cis-lunar space.
http://www.w3.org/ns/prov#wasQuotedFrom	planetary.org