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Mega Disaster episode on the History Channel
On a History Channel Mega Disasters episode (sorry, no link on their site), they detailed what would happen to the earth if we got hit with a Gamma Ray burst. The predicted results were quite gruesome with the ozone layer being stripped off and a thick layer of smog being created giving the sky a sickly greenish color. University of Kansas believe the Earth was hit with one of these before, approx. 450 million years ago, which they think caused the mass extinction at the end of the Ordovician Period (much earlier than the dinosaur extinction). So, while the "death ray" here is a continuous stream, just imagine what it is doing to the life on any of the planets its hitting.
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