Dinosaur-Killing Asteroid Didn’t Just Strike Earth, Its Dust Cloud Cooked It
Sci.News · 2026-07-29
The asteroid impact 66 million years ago near Chicxulub in what is now Mexico, which unleashed 10^23 joules of energy and formed a 180-200 km crater, may have caused mass extinction through extreme heat and widespread wildfires, according to a recent study by Purdue University's Brandon Johnson and colleagues. Their research suggests that debris ejected into space, specifically molten spherules and fine dust, played a crucial role. As spherules re-entered Earth's atmosphere, friction generated intense heat, which was then amplified by the vast amounts of fine dust suspended in the air. This combination would have drastically scorched the land and fueled global fires, killing nearly all life within the first few hours. The fine dust clouds would have also blocked daylight, creating a dark, hellish landscape illuminated only by the reddish glow of wildfires, with only burrowing or aquatic creatures having a chance of survival.
_The full article also explores the ongoing debate surrounding the primary drivers of the K-Pg mass extinction event._