Assertion: spacecraft's mission | /r/HasProperty | done without return
Facets:
value: to earth
type: TRANSITIVE-OBJECT
value: with less difficulty
type: MANNER
value: with expense
type: OTHER
Source sentences:
text: In 1988, space activist Bruce Mackenzie proposed a one-way trip to Mars in a presentation at the International Space Development Conference, arguing that the mission could be done with less difficulty and expense without a return to Earth.