Assertion: nebula | /r/HasAspect | the brightest nucleus
Facets:
Source sentences:
text: They are near the ear of Asterion, the northern hound; and the smaller nebula, or northern one, having the brightest nucleus, was differentiated by the wire micrometer; they are 3deg southwest of Alkaid, where the place is indicated by a line from Dubhe through Megrez, extended nearly twice that distance into the southeast beyond.