Assertion: nebula's cloud | /r/CapableOf | block light
Facets:
value: behind them
type: LOCATION
value: from luminous objects
type: OTHER
Source sentences:
text: Similar nebulae not illuminated by stars do not exhibit visible radiation, but may be detected as opaque clouds blocking light from luminous objects behind them; they are called dark nebulae.
text: Emission nebulae often have dark areas in them which result from clouds of dust which block the light.
text: Similar nebulae not illuminated by stars do not exhibit visible radiation, but may be detected as opaque clouds blocking light from luminous objects behind them; they are called "dark nebulae".