http://apod.nasa.gov/apod/ap120912.html
In this image of the M7 open star cluster, you can see many stars, but mostly dominated by blue ones, in the tail of Scorpius. The M7 star cluster contains around 100 stars and there are about 30 or so very visible ones. It is apparent that this large open star cluster has been known since the year of 130 AD, which was first noted by Ptolemy. A few dark clouds are also visible in the image along with millions upon millions of other stars far out past the constellation of Scorpius. This open star cluster is 25 light years across, which is massive, and is around 100 light years away. Being that this star cluster is 200 million years old, it may be possible that one of the stars in this cluster could have died, and we wouldn't even know for another 100 years because it is so far away that the light takes so long to reach us.
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