About: http://webisa.webdatacommons.org/264112497

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	At some point a material shield simply could not protect the ship.Also, as long as we are limited to fusion, there is a limit to the speed achievable with a practical mass ratio.
http://www.w3.org/ns/prov#wasQuotedFrom	phys.org