The asteroid measures 0.31 miles (0.5 kilometers ... could last for more than four years after the initial impact. The dust plume would also deplete the ozone layer. "Severe ozone depletion ...

Plumes of sulphur-based gases and fine dust blocked out the sun, causing an “impact winter” that lasted for 15 years. Sun-blocking dust from asteroid impact drove the dinosaur extinction The ...

Did a collision with a giant asteroid or comet ... came quickly, the impact must have spelled the cataclysmic end. For months, scientists conclude, dense clouds of dust blocked the sun's rays ...

NASA's James Webb Space Telescope has unveiled an awe-inspiring celestial spectacle of a spiral galaxy interacting with a ...