Asteroid impact that killed the dinosaurs also cooled the Earth

The asteroid that wiped out the dinosaurs also caused a temporary but devastating "impact winter" -- darkening the sky, cooling the Earth and inhibiting photosynthesis, new research suggests. Sixty-six million years ago, a 6.2-mile-wide asteroid known as Chicxulub struck the Earth off the...



via L.A. Times - Science http://ift.tt/QErbPX