PopSci - decades of debate on the cause of the mass extinction that killed off the dinosaurs and a slew of other species on Earth 65.5 million years ago. Now, after reviewing 20 years worth of data and research, an international team of scientists concludes that it was a a huge meteorite strike that caused an explosion on Earth that was a billion times more powerful than the Hiroshima atomic bomb. The material that blasted into the atmosphere triggered a global winter, and researchers say much of life on Earth was gone within days... triggered the extinction.
A paper on the study appears in the March 4 issue of the journal Science.
