Scientists identify rare meteorite that killed dinosaurs
The mystery of the dinosaur-extinguishing impactor solved after 66 million years.
1Dinosaur-killing meteorite identified
Researchers have determined that the meteorite which struck Earth 66 million years ago, causing dinosaur extinction, was a rare type called CO chondrite. This discovery provides new insights into the Cretaceous-Paleogene extinction event.
2Nickel isotopes revealed the clue
By analyzing nickel isotopes in the global clay layer formed after impact, scientists identified the meteorite's composition. This breakthrough was achieved despite the vaporization of most impactor material upon collision.
3Surprising compositional difference
CO chondrites' lower sulfur content challenges extinction theories. New evidence suggests atmospheric debris clouds, rather than meteoritic sulfur, may have been the primary driver of global devastation.
4Primordial solar system material
Ornans-type carbonaceous chondrites are among the most primitive materials from the solar system's formation. Representing just 5% of Earth's meteorites, this rare type marked terrible luck for dinosaurs.
5The scale of Chicxulub impact
The 10-15 km wide meteorite struck at 64,000 km/h, creating Mexico's Chicxulub crater. Ejected debris caused global climate changes, with atmospheric particulates blocking sunlight for years.
6Pivotal moment in planetary history
This discovery illuminates one of Earth's greatest mass extinction events. The catastrophic impact by a rare space rock became a defining moment in life's evolutionary trajectory.