Regions North America
Two Asteroids, One Dinosaur Extinction: Second Crater Bolsters Double Impact Theory
The 5.3-mile-wide crater is now confirmed to be 66 million years old, suggesting that the dinosaurs' extinction was marked by the impact of at least two giant space rocks.
Sharp, three-dimensional seismic data of a seafloor crater off Guinea seems to confirm that a second asteroid hit Earth at approximately the same time as the behemoth that hit North America 66 millio… [+3928 chars]
