Assertion: dark matter | /r/HasProperty | observed
Facets:
value: directly
type: MANNER
Source sentences:
text: Dark matter is only known by its effect on massive astronomical bodies, but has yet to be directly observed or even identified.
text: Dark matter may account for over three-quarters of all matter in the universe, but it can’t be observed directly.
text: Thus, dark matter’s gravitational impact is extremely spread out and, it turns out, can only be observed when we look at the large-scale distribution of visible matter in the universe