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They're fine. Here, I discussed the effects of a supernova on life on Earth. Note that a supernova would have to be within about ten parsecs (~33 light-years) to have harmful effects on life on Ea...
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#1: Attribution notice removed
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System
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2020-06-01T14:13:45Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/17009 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/