Assertion: solar system's planet | /r/CapableOf | use four complex spacecraft
Facets:
value: highly
type: DEGREE
value: to explore the five outer planets
type: PURPOSE
Source sentences:
text: The two-spacecraft Voyager missions were designed to replace original plans for a “Grand Tour” of the planets that would have used four highly complex spacecraft to explore the five outer planets during the late 1970s.