Assertion: comet | /r/HasProperty | demonstrated by fred whipple
Facets:
value: in 1951
type: TEMPORAL
Source sentences:
text: Comets can produce debris by water vapor drag, as demonstrated by Fred Whipple in 1951, and by breakup.
text: Comets can produce debris by water vapor drag, as demonstrated by Fred Whipple in 1951, and by breakup.