The Kiowa myth of the Seven Sisters explains the existence of the Pleiades star cluster, which appears in the North American sky each year at the beginning of winter. The Pleiades is one of the most widely recognized star clusters in the night sky, and it was of critical importance to ancient people, as its appearance in the sky signaled the change of seasons. In the Northern Hemisphere, it signaled the onset of winter, and in the Southern Hemisphere, it signaled the onset of summer. People all over the world recognized its importance, and they assigned it a place in their myths and legends.
Throughout the mythologies of the world, the Pleiades was personified as seven sisters, or seven maidens. It is a cluster of seven stars, only six of which are visible to the naked eye. However, for reasons not fully understood, ancient people recognized the cluster as having seven stars but missing one. Many cultures tell stories of these seven stars, often in an attempt to explain why one of the stars was missing. Other legends of the Pleiades simply explain how the cluster of stars got into the sky in the first place. In Kiowa myth, the Pleiades is also personified as seven maidens. They were transported to the sky by the Great Spirit, who sent them away from the earth to save them from giant bears.
The link below contains a link to the Kiowa legend of the Pleiades.