Callisto

Greek Mythology: In Greek mythology, Ursa Major is associated with the nymph Callisto.

According to the myth, Callisto was transformed into a bear and placed in the sky by Zeus.

Planet

Jupiter

The four largest moons—Io, Europa, Ganymede, and Callisto—were discovered by Galileo Galilei in 1610 and are known as the Galilean moons.