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Dead star remnants flare in X-rays as black holes devour surviving companions
NASA's Chandra X-ray Observatory detected dozens of supernova remnants in a nearby galaxy that are flaring and flickering in X-rays instead of cooling quietly. In each case, a companion star survived its partner's explosion only to be slowly devoured by the resulting black hole or neutron star. The discovery transforms what were thought to be calm stellar graveyards into unexpectedly active, dynamic systems.
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