About: http://webisa.webdatacommons.org/439791848

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	Moving safely from rock to rock or location to location is a major challenge because of the communication time delay between Earth and Mars, which is about 20 minutes on average.
http://www.w3.org/ns/prov#wasQuotedFrom	nasa.gov