No one disputes that one, if the Sun turned into a super nova it would definitely take out the Earth :-). And we know that a star going nova in the Large Magell

No one disputes that one, if the Sun turned into a super nova it would definitely take out the Earth :-). And we know that a star going nova in the Large Magellanic Cluster (nearest galaxy to the Milkyway) would not cause one[1], so we've got a set of boundary conditions to start with. Next step is to iterate between those extremes to come up with a more accurate answer. [1] https://en.wikipedia.org/wiki/SN_1987A https://en.wikipedia.org/wiki/SN_1987A