Assertion: black hole's mass | /r/CapableOf | revolve about one another
Facets:
value: in a period of 5.6 days
type: TEMPORAL
Source sentences:
text: Discovered in 1971 in the constellation Cygnus, this binary consists of a blue supergiant and an invisible companion 14.8 times the mass of the Sun that revolve about one another in a period of 5.6 days.