Final answer:
The Summer Triangle is made up of three constellations that form a triangle shape in the sky.
Step-by-step explanation:
The Summer Triangle consists of three constellations in which their main stars (brightest) make a triangle in the sky.
Constellations form patterns that are recognized and named, often after mythological characters or animals. Orion the hunter and Ursa Major, known as the Big Dipper or the Big Bear, are examples of such patterns. Clusters like the Pleiades can also be found within these constellations, adding to the rich tapestry of the night sky that has been navigated and storied by various cultures through history.