Assertion: black hole | /r/HasProperty | hard to see
Facets:
value: notoriously
type: MANNER
Source sentences:
text: That’s because black holes are notoriously hard to see.
text: Smaller black holes are hard to spot, and they tend to be isolated.
text: Black holes are hard to see in detail because the large ones are all far away.
text: Of course a black hole itself would be hard to see!