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The Hyades

All stars emit X-rays, although some are more luminous than others. A star cluster allows us to to investigate the properties of a sample of stars all with approximately the same age. The Hyades was formed about 700 million years ago. The proximity of the Hyades to the Sun (about 150 light years) allows the detection of relatively low luminosity sources. These stars are much less luminous than the X-ray binary stars detected in our local galaxy and the nearby Andromeda galaxy. In this composite image, 108 stars out of a total of 500 known members of the cluster have been detected.

 
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