About: http://webisa.webdatacommons.org/214558507

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	The main problem is that we would probably have less than 6 months notice between detection time and impact, especially if the object is a comet coming in from the outer solar system at 50 km/sec.
http://www.w3.org/ns/prov#wasQuotedFrom	permanent.com