Assertion: astronomer | /r/CapableOf | spend three to six years
Facets:
value: as a postdoctoral research student
type: TEMPORAL
value: after getting a phd
type: TEMPORAL
value: usually
type: TEMPORAL
Source sentences:
text: After getting a PhD, astronomers usually spend three to six years in one or more postdoctoral positions in universities or research institutions.
text: Education: Most astronomers in Canada have earned a PhD in astronomy and spent three to six years as a postdoctoral research student.