Understanding the Extinction of Dinosaurs

The non-avian dinosaurs went extinct approximately 66 million years ago, marking the end of the Cretaceous period and the beginning of the Paleogene period. This pivotal event is known as the Cretaceous-Paleogene (K-Pg) extinction event, and it was primarily caused by a catastrophic asteroid impact.

The leading scientific theory points to a massive asteroid, roughly 10-15 kilometers (6-9 miles) in diameter, striking the Earth in what is now the Yucatán Peninsula in Mexico. This impact created the Chicxulub crater and triggered a global cataclysm. The immediate effects included widespread tsunamis, wildfires, and a massive dust cloud that blocked out the sun for an extended period. This led to a drastic drop in global temperatures and a collapse of photosynthesis, devastating plant life and, consequently, the herbivorous dinosaurs and the carnivores that preyed on them.

While the asteroid impact was the primary trigger, other factors like massive volcanic eruptions in the Deccan Traps (India) may have contributed to environmental instability leading up to the event. However, the asteroid impact is widely accepted as the definitive cause of the rapid and widespread extinction of non-avian dinosaurs and about 75% of all plant and animal species on Earth.

Pro tip: Not all dinosaurs died out! Modern birds are direct descendants of avian dinosaurs that survived the K-Pg extinction, meaning dinosaurs still walk among us today.