LeadSongDog (1120683) writes "A new paper, complete with pretty pictures, on the arXiv at http://arxiv.org/pdf/1305.7399v1.pdf details some remarkable lessons from a local (inside our galaxy) supernova circa 1900. The formal publication is due to be out in Astrophysical Journal Letters on July 1, and a popsci blurb is available at http://phys.org/news/2013-06-remarkable-supernova.html for the busy readers of
Studying the radio and x-ray emissions (synchrotron radiation from energetic electrons at the shockwave front) allowed researchers to find variations in metal distribution around the sphere. They estimate the event produced 10^20kg of electron/positron pairs, nearly all of which have since recombined.
I for one am rather glad I wasn't nearby that day."
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