Assertion: black hole | /r/HasProperty | detected including evidence
Facets:
value: directly
type: MANNER
Source sentences:
text: The accretion-disc energy-production mechanism was finally modeled in the 1970s, and black holes were also directly detected (including evidence showing that supermassive black holes could be found at the centers of our own and many other galaxies), which resolved the concern that quasars were too luminous to be a result of very distant objects or that a suitable mechanism could not be confirmed to exist in nature.