the entry is correct that the chicxulub crater is the 'accepted' cause of the K-T boundary... but like any good scientific theory, there are plenty of highly respected scientists who argue with it. The main argument isn't that the meteor impact happened, but that it wasn't severe enough to have caused the extinction of most life on earth in such a short period. Many argue against the "kicking up a dustcloud to cause a nuclear winter" theory.

i used to know a whole lot more on this subject. before i graduated college and lost most of my brain cells.