Seven Sisters Versus California
http://apod.nasa.gov/apod/ap091103.html
The Pleiades star cluster, or the Seven Sisters or M45, is a group of around 3000 stars that are about the same age; they were formed in a cloud of dust and gas. The cluster is 400 light years away and easy to see. The bluish coloring is caused by dust that reflects light from the stars. M45 is an open cluster, which means the stars are only loosely bound together by their gravitational forces. Also in this picture is the California nebula, which is not as easily visible as the Pleiades. It consists mainly of glowing hydrogen gas.
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