The nearby Milky Way open cluster that forms the head of Taurus the Bull is the Hyades.
The Hyades is the closest open cluster to the Sun, lying about 153 light-years away in the constellation Taurus. Its member stars share a common origin, age, chemical composition, and motion through space. Their brightest stars make a distinctive V-shaped pattern, traditionally interpreted as the head of the bull.
The bright orange star Aldebaran appears within that V from Earth, but it is not a member of the Hyades. At about 65 light-years away, Aldebaran is much closer and merely lies along the same line of sight. Four Hyades giants plus Aldebaran create the familiar outline seen in the sky.
The cluster is estimated to be about 625 million years old and contains hundreds of stars, including an extended halo beyond its dense core. It is sometimes confused with the Pleiades, another famous cluster in Taurus. The Pleiades resembles a compact group of bright blue stars, whereas the older Hyades is recognized by its broad V-shaped arrangement.