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2019-11-04: Why We Might Be Alone in the Universe

  • 10:04: ... atmosphere and water content and may have been lucky in avoiding various cosmic catastrophes like gamma ray ...

2017-12-20: Extinction by Gamma-Ray Burst

  • 01:17: ... get to each of these inevitable cosmic catastrophes, but let's start with the one that could happen any time-- a supernova or ...
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