The Pleiades star cluster, M45, lies at a distance of 380 light years and is one of the most recognized clusters in the sky.  It is visible to the unaided eye even in light polluted skies.  In moderate skies, 6 of the brightest stars shine in a distinctly "dipper" shape.  As many as nine stars are readily visible in darker skies. The cluster consists of approximately 500 stars of varying magnitude and extends across a diameter of about 2 degrees.  This equates to the diameter of 4 times that of the full moon.  The Pleiades is also known as "The Seven Sisters". This is a reference to the seven daughters of the Greek gods Atlas and Pleione.

¹ http://www.seds.org/messier/m/m045.html