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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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