Assertion: nebula's star | /r/CapableOf | form the summer triangle
Facets:
Source sentences:
text: Messier 57 lies to the south of Vega, the brightest star in Lyra and one of the stars that form the Summer Triangle, a prominent asterism found overhead in the summer sky.
text: Because of its proximity to Vega, the brightest star in Lyra and one of the stars that form the Summer Triangle, the nebula is relatively easy to find using binoculars or a small telescope.