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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.