Abstract
There have been nearly one hundred different dinosaur extinction theories offered in recent decades. These range from poisonous plantsf to mass suicide by dinosaur herds. One particular extinction theory has gained wide acceptance since the 1980s. It involves a major earth impact by an asteroid or comet. This catastrophe is thought to have extinguished up to two-thirds of all animal and plant species living at the time. This article explores the dinosaur-collision connection, a continuing scientific debate.