Well, it will be an interesting debate, intellectually stimulating. A bolide shower of micrometeorite sphericules as in the tunguka event of 1908 would not leave a pattern of only vertical impacts, more of a spray instead; whereas the shock wave from a supernova would do just that. Recently the magnetosphere/ionosphere was hammered down into the stratosphere by a distant energy burst so these events are more common than rare : it's a violent universe out there, amazing that we've lasted this long. Example : the indonesian super volcano that produced a nuclear winter for 3 years 74,000 years ago, almost wiping out our homo sapien ancestors. We see this in the mitochondrial DNA record : only a few hundred individuals survived out of what must have been a much larger population. Science, not theologians, opens the book on many of these mysteries.
Yes, the Toba eruption 74kya, left a crater 18 by 50 or 60 miles (I couldn't find my reference just now but that is what I remember). One heck of an impact. Some scientists say it reduced the earth's human population of 5 or 10,000 individuals, and I think that includes Neanderthals, and obviously those new Flores folk.
While reading this post I came across the following; "A candidate for the reverse shock wave is the supernova remnant North Polar Spur, with an estimated age of 75,000 years and a distance of...424 light years,...locatd in the north sky from where it would have preferentially irradiated the Northern Hemisphere." At the time I thought now isn't that an interesting coincidence.
Is it possible that major cosmic energy bombardments, influence major volcanic and techtonic events here on earth? Jaggar in "Volcanoes Declare War," 1945, shows an interesting chart of Kilauea volcano in Hawaii in which he observes an apparent correlation between the maximum altitude of the lava pool with sunspot minima, p. 149.
It would be interesting if scientists would look at that, if they haven't already. Regarding a stepwise lowering of world temperatures from about 28,000 BP to 18,000 BP, one step occurred at 22,000 ya, and I find the Sakara-jima volcano in Japan blew out a caldera 15 miles in diameter. I am still looking for other smoking guns. This may have been the final blow to Neanderthals.