Assertion: black hole's event horizon | /r/HasProperty | region
Facets:
value: in general relativity
type: OTHER
value: in space-time
type: LOCATION
Source sentences:
text: In general relativity, an event horizon is a region in space-time beyond which events cannot affect an outside observer.
text: There was no obvious evidence that it lacked an event horizon (the region beyond which no light can escape) and it didn't dramatically deviate from the no-hair theorem, Isi said.