From MSNBC:Last March our planet looked straight down the barrel when one of the universe's most deadly kinds of stellar artillery fired — and we lived to tell about it.
The March 19 cosmic cannon was a jet of powerful gamma rays that shot out matter at speeds just a hair shy of the universal speed limit — that of light.
The explosion, which occurred not far from the handle of the Big Dipper, was even more remarkable because it was accompanied by enough visible light to be seen briefly with unaided human eyes. That's despite the fact that the dying mega-star that created the blast was in another galaxy, a whopping 7.5 billion light-years away.
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