Assertion: nebula's surface brightness | /r/HasProperty | low
Facets:
value: pretty
type: DEGREE
value: relatively
type: DEGREE
Source sentences:
text: It is quite large and has a relatively low surface brightness, but it can be seen in amateur telescopes in good conditions, with clear skies and no light pollution.
text: Even though the Veil Nebula is relatively bright with an apparent magnitude of 7.0, it stretches over a large area and its surface brightness is pretty low, which makes it difficult to see without an OIII filter.