The constellation with seven stars is called the Pleiades, or sometimes referred to as the Seven Sisters. The Pleiades is one of the most well-known open star clusters in the night sky. It is visible to the naked eye and has been recognized by various cultures throughout history. The seven brightest stars in the Pleiades are named Alcyone, Atlas, Electra, Maia, Merope, Taygeta, and Pleione.