What asterism is created by the stars Altair, Deneb, and Vega?

The asterism formed by the stars Altair, Deneb, and Vega is known as the Summer Triangle. This prominent asterism is easily recognizable in the night sky during the summer months in the Northern Hemisphere. Each star contributes to forming a triangle shape: Vega is located in the constellation Lyra, Altair is in the constellation Aquila, and Deneb is part of the constellation Cygnus. The Summer Triangle is notable not only for its bright stars, which are among the brightest visible in the night sky, but also for the distinct seasonality it represents, being primarily visible in warmer months when nights are clear and conducive for stargazing.

In contrast, other options represent different arrangements of stars or constellations. The Winter Triangle consists of different stars and is visible in winter, whereas Orion's Belt is a well-known feature of the Orion constellation, and the Great Square is a group formed by stars from the constellations Pegasus and surrounding areas, which doesn't include Altair, Deneb, or Vega.