Assertion: black hole's galaxy | /r/HasProperty | observed 7.2 × 6.8 arcminutes
Facets:
value: at a surface brightness of 12.9
type: OTHER
Source sentences:
text: The galaxy can be observed using a small telescope with a 6 cm (2.4 in) aperture, extending across an angular area of 7.2 × 6.8 arcminutes at a surface brightness of 12.9, with a very bright, 45-arcsecond core.