The "seven identical sisters" refers to a group of seven stars in the constellation Pleiades. These stars are also known as the Seven Sisters and are part of a larger cluster called the Messier 45. They are located about 440 light-years away from Earth and are visible to the naked eye. The stars in the Pleiades cluster are relatively young, with an estimated age of around 100 million years. They are often associated with various myths and legends across different cultures, symbolizing beauty and unity. The cluster is best viewed in the winter months in the Northern Hemisphere.