That "if it hits a populated area" reduces the probability by a factor 100 (because about 1% of the world's surface is urbanized [1]). So the actual frequency

That "if it hits a populated area" reduces the probability by a factor 100 (because about 1% of the world's surface is urbanized [1]). So the actual frequency of "city wiped" is more like once every 10000 years. Completely negligible compared to other city-wiping events (earthquakes or floods for example). [1] https://en.wikipedia.org/wiki/File:Global_land_use_for_food_production,_OWID_statistic.png https://en.wikipedia.org/wiki/File:Global_land_use_for_food_...