the large scale of extinction of K-T, sometimes it seems that a very large Crater hit the Earth and making a tremendous explosion and creating clouds of volcanic dust over the sky cousing the long period of none sunlight, is the reason of Dinosaurs extinction. but there is some debt yet.
another fact is the Comet Shoemaker-Levy 9 who hit the Jupiter in July 1994, it wasn't any single collision, it was a series of them. so if there was any comment coming to the Earth at K-T time there were some main hits and other smaller hist, which happened not at the same time may be with a several years of period which can make enough time to change the climate by storms and the volcanic dust clouds , eliminating plants and starving the animals.
this can be the connecting point of these two facts.
all the images are from wikipedia.org
