Second Crater Bolsters Double Impact Theory
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 million years ago, ending the reign of the dinosaurs. A team of researchers recently imaged the 5.28-mile-wide (8.5-kilometer-wide) depression off the African coast, … Read more