Yeah, it looks like a supernova 1500 ly away might produce enough gamma rays that we could actually measure their effect on the ozone layer but not enough that

Yeah, it looks like a supernova 1500 ly away might produce enough gamma rays that we could actually measure their effect on the ozone layer but not enough that it would be concerning. https://en.wikipedia.org/wiki/Near-Earth_supernova https://en.wikipedia.org/wiki/Near-Earth_supernova Unexplained dimmings do give rise to the question of "Is it about to explode" but we have a good sense of how often large explosions occur in galaxies because they're so obvious and so I suppose I shouldn't be concerned about natural phenomenon. And given the potential expansion rates of being who could create megastructures like this our priors on that explanation have to be pretty low.