Constellations have been observed and documented since 1000 BC by early civilizations like the Babylonians, with the ancient Greeks recording many myths associated with patterns of stars. Constellations refer to recognizable patterns of stars often relating to Greek mythology, while asterisms are subsets within constellations that form other shapes, such as the stars that compose the Big Dipper within the larger Ursa Major constellation. Some constellations exist merely as shapes people imagine they see within clouds or patterns of stars, like the fictional "Eddie the Head" believed to bring misfortune and death to those who glimpse it.

1. Constellations By Mike O’Neill