Assertion: gamma ray | /r/HasSubevent | low resolution
Facets:
value: very
type: DEGREE
Source sentences:
text: Their observation is much more problematic than that of X-rays or of visible light, because gamma-rays are comparatively rare, even a "bright" source needing an observation time of several minutes before it is even detected, and because gamma rays are difficult to focus, resulting in a very low resolution.