We are all familiar with the Pleiades, an open cluster of young hot stars. However, the Pleiades are more than just seven sisters. In X-ray the cluster shows us that the brightest star optically is extremely dim in X-ray, and some of the optically dim stars are very energetic in the X-ray spectrum. This is a good example of why it is important to look at deep-sky objects with other wavelengths.

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Slide 16 of 27