Double space strike 'caused dinosaur extinction'

Double trouble for dinosaurs: Did more than one asteroid or comet strike cause their demise? The dinosaurs were wiped out 65 million years ago by at least two space impacts, rather than a single strike, a new study suggests. Previously, scientists had identified a huge impact crater in the Gulf of Mexico as the event that spelled doom for the dinosaurs. Now evidence for a second impact in Ukraine

[kumicit]

少なくとも2発。