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Last updated on April 25, 2014 at 1:22 EDT
Artists impression of Her X-1
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Artist's impression of Her X-1

January 8, 2013
Hercules X-1 is a prototypical binary system formed by a pulsar (a neutron star) and a low mass companion star. In this system mass flows from the companion onto the neutron star, forming an accretion disk.