About: http://webisa.webdatacommons.org/54471880

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	They seemed to be solid and rigid (unlike a balloon), and they were completely round with no appendages, attachments, windows, portholes, or other features.
http://www.w3.org/ns/prov#wasQuotedFrom	nuforc.org