Scientists Identify Rare Meteorite That Killed the Dinosaurs 66 Million Years Ago
Researchers have determined that the asteroid responsible for the dinosaur extinction 66 million years ago was likely an exceptionally rare type of meteorite from a distant region of the solar system, based on its unusual chemistry that produced massive amounts of planet-cooling dust and debris.
Identifying the Dinosaur-Killer Meteorite
Scientists have identified the rare meteorite that killed the dinosaurs 66 million years ago, determining that the asteroid was likely an exceptionally rare CO chondrite from a distant region of the solar system. This discovery, published on July 19, 2026, offers new insights into one of Earth's most catastrophic events.
Significance of the CO Chondrite Classification
The classification of the impact asteroid as a CO chondrite is significant because these meteorites are exceptionally rare among known samples. The asteroid's unusual chemistry suggests that planet-cooling dust and debris were produced in massive quantities. This explains the dramatic climate changes that followed the impact and contributed to the mass extinction of three-quarters of all species on Earth.
Connecting Chemistry to Extinction
Research also found evidence that about 800 million years ago, a catastrophic asteroid breakup may have triggered a huge wave of impacts across the inner solar system, with debris launched from near a gravitational gateway controlled by Jupiter, sending fragments toward Earth, the Moon, and Mars. The new findings about the Cretaceous-Paleogene boundary impact provide a crucial piece of understanding how impacts shape planetary history.
Research Methods and Broader Context
The research involved analyzing the chemical composition and isotopic signatures of the meteorite to determine its origin and classification. Understanding the exact nature of the impactor helps scientists reconstruct the conditions immediately following impact and the resulting environmental changes. These findings add to a growing body of evidence showing how extraterrestrial impacts have profoundly influenced the evolution of life on Earth.