Assertion: halley type comet | /r/CapableOf | deliver water
Facets:
value: to earth
type: TRANSITIVE-OBJECT
value: in the distant past
type: TEMPORAL
Source sentences:
text: The ratio of deuterium to hydrogen in the water released by Halley was initially thought to be similar to that found in Earth's ocean water, suggesting that Halley-type comets may have delivered water to Earth in the distant past.