Assertion: nebula's region | /r/HasProperty | strong source of radio waves
Facets:
value: in x-rays
type: LOCATION
value: in 1949
type: TEMPORAL
value: in 1963
type: TEMPORAL
Source sentences:
text: The region around the star was found to be a strong source of radio waves in 1949 and X-rays in 1963, and was identified as one of the brightest objects in the sky in gamma rays in 1967.