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Radio signals help to provide evidence for a type of supernova triggered by a black hole or neutron star on the rampage.
It starts with a familiar tale. Two massive stars are born from a cloud of gas and dust. One eventually runs out of fuel, forming either a neutron star or a black hole. But then, in a fratricidal twist, this compact object spirals closer and closer to the other star, sweeps through its sibling’s atmosphere and eventually tugs on its core so hard that it explodes.