Which "rumored asteroid" do you refer to? You don't think an asteroid caused the Chicxulub crater? There's an awful lot of evidence in support of it. How else

Which "rumored asteroid" do you refer to? You don't think an asteroid caused the Chicxulub crater? There's an awful lot of evidence in support of it. How else do you explain a 180 km crater, the iridium layer, the shocked stone, the ejecta spherules, etc? There are several relevant asteroid theories. Since you say "negate", I assume you mean the theory that the asteroid was the sole cause of the K-Pg extinction event? Shrug. Okay. Perhaps there were multiple causes; volcanism, marine regression, and extraterrestrial impact. https://en.wikipedia.org/wiki/Cretaceous%E2%80%93Paleogene_extinction_event#Multiple_causes https://en.wikipedia.org/wiki/Cretaceous%E2%80%93Paleogene_e... . I don't think anyone would be severely upset should this prove true. That's still an asteroid theory.