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Astronomers identify first twin stars doomed to collide in kilonova explosion

Although massive stars usually die with spectacular explosions, a handful fizzle out like misfire firecrackers.

Astronomers have identified the remains of such a failed firecracker in SGR 0755-2933, a neutron star about 11,400 light-years from Earth in the southern constellation of Puppis. In new research, scientists say that earlier in life, this Star transferred abnormally high amounts of mass to its binary companion – so much so that it did not have enough material left for an explosive death. Instead, it ended in a calm “ultra-stripped” supernovaa rare cosmic event that leaves in its wake a super-dense residue called a neutron star.

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