It's difficult to say definitively which constellation is the *most* popular, as popularity can vary based on culture, location, and time period. However, some of the most well-known and recognizable constellations include:

* Ursa Major (The Great Bear): This is likely the most recognizable constellation globally, thanks to its prominent "Big Dipper" asterism.

* Ursa Minor (The Little Bear): Often associated with the North Star (Polaris), it's another easily recognizable constellation.

* Orion (The Hunter): This striking constellation features a prominent belt of three stars and is visible from both hemispheres.

* Taurus (The Bull): This constellation is known for its red giant star, Aldebaran, and its associated Pleiades star cluster.

* Gemini (The Twins): This constellation features two bright stars representing Castor and Pollux, the twins of Greek mythology.

Ultimately, the "most popular" constellation is subjective. However, these constellations consistently rank highly in terms of recognition and cultural significance.