Astronomers have observed the 3-D structure and motion of debris left in the wake of a supernova that was seen to detonate almost 900 years ago. The supernova appeared to be a kind called type 1a, wherein a white dwarf star detonates, destroying itself in the process. The star was surrounded by spiky filaments stretching about three light-years in all directions. The system is structured like a three-layered onion, with the filaments emerging from the dust shell. The study shows that the remnant is almost definitely from the guest star of 1181.
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