Know since ancient times as the Seven Sisters, the Pleiades Cluster, to the right of the image consists of arouind a thousand stars, which formed toether about 100 million year ago. This unusual view shows the Pleiades Cluster in the borader context of its local environment, driftin through a chaotic region of dark dusk. The glowing cloud of hydrogen gas to the left of the image is the California Nebula names for its resemblance to the US state.