Assertion: black hole | /r/CapableOf | separate by only about 490 light-years
Facets:
value: from each other
type: OTHER
Source sentences:
text: Using NASA's Chandra X-ray Observatory, investigators detected two black holes at the center of a galaxy dubbed NGC3393, with one black hole about 30 million times the mass of the sun and the other at least 1 million times the mass of the sun, separated from each other by only about 490 light-years.