Hey all, It’s been a while since I’ve visited the forums but my question is strangely one that I’ve had a difficult time trying to find an answer for. I was wondering if anyone either knows or can point me to information regarding the effective destruction radius of a supernova, preferably for Type 1a. By destruction radius I mean the distance in light years that the supernova shockwave could either cause irreversible destruction on the terrestrial planets within a star system or destroy the ozone of a system's planets to the point that they could no longer protect all but the most hardy microbial life. Specifically, I’m looking for the range within a galaxy that a supernova would pose a mass extinction event to animal life. I’ve heard that some Type 1a Supernova can be a potential threat to humans within a range as large as 3300 LY. However, the terms of threat to humans were somewhat vague in all the sources I’ve read. I don’t care what range a supernova may potentially induce cancer or interfere with circadian rhythm. I want to know how close a system must be to have complex life eradicated either directly from the blast of the shockwave or by means of stripping the ozone to lethal levels. I was also hoping I could get some clarification regarding the velocity of a supernova shockwave. I’ve read that the shockwave can expand anywhere from 1-10% c. I thought that Type 1a supernova always went nova at 1.4 solar masses so shouldn’t this number be in a fairly well defined range? Any information would be greatly appreciated. I wish I could say this information was going to be used for some noble cause, but alas, I’m just an amateur sci-fi writer that needs some help.