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A few days, at best If you want to detect a supernova as quickly as possible, you need a neutrino detector. Supernovae produce substantial amounts of neutrinos - which actually carry away much of ...
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#1: Attribution notice removed
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System
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2020-06-01T14:13:47Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/31595 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/