Study pinpoints dinosaur-killing asteroid struck Earth in Northern spring

Sixty-six million years ago, a rock from the sky ended an era — and new science now tells us it arrived in spring, when life in the Northern Hemisphere was at its most tender and exposed. Researchers studying fossilized fish bones from North Dakota have determined, with unusual precision, that the Chicxulub asteroid struck during the season of renewal and reproduction, compounding catastrophe upon vulnerability. The timing was not merely incidental: for species already pouring their energy into new life, the disaster arrived at the worst possible moment. In this detail, ancient geology offers