The Pleiades, also known as the Seven Sisters and Messier 45, are an open star cluster containing middle-aged, hot B-type stars located in the constellation of Taurus. It is among the star clusters nearest Earth and is the cluster most obvious to the naked eye in the night sky.
Taurus is composed of two main groups of stars; the Pleiades and Hyades. The Pleiades are a star cluster with eta (η), Alcyone, as the principal star, situated on the shoulder of the Bull, also known as the Seven Sisters and Messier 45, or M45. Traditionally six of the stars are visible to the naked eye, another star is "lost" or "invisible" giving rise to stories and legends explaining the reason. In Japan they are called "Subaru". Their Persian name is "Soraya".
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