Assertion: nebula's light | /r/HasProperty | emission
Facets:
value: from oxygen
type: CAUSE
Source sentences:
text: The visible light is emission from oxygen that has been heated by higher-energy (ultraviolet and X-ray) synchrotron radiation.
text: The visible light is emission from oxygen that has been heated by higher-energy (ultraviolet and X-ray) synchrotron radiation.