Assertion: black hole | /r/CapableOf | emit no light
Facets:
Source sentences:
text: Black holes usually cannot be observed directly on account of both their small size and the fact that they emit no light.
text: Essentially, we know that black holes exist because even though they don’t emit light, they do have lots of gravity.
text: However, since black holes don’t emit any light, they can’t be observed in the usual way.
text: Black holes emit no light, though, supermassive black holes, like the one at the heart of galaxy Messier 87, are fringed by bright disks of hot matter.