About 66 million years ago, an asteroid larger than Mount Everest hit Earth. As a result of that event, three-quarters of life on the planet, including dinosaurs, was wiped out. That’s what we know so far.
Recent theories suggest that sulfur from the asteroid’s impact or soot from the global forest fires it sparked blocked the skies and trapped the world in a long, dark winter. This condition causes all people and animals to die, except for a lucky few.
“Fine silicate dust from rock fragments will persist in the atmosphere for 15 years, reducing global temperatures by up to 15 degrees Celsius,” the researchers said in a study in the journal Nature Geoscience. headtopics.com
Their claims were initially met with skepticism — until a decade later when the massive Chicxulub crater was discovered on what is now the Yucatan Peninsula in the Gulf of Mexico. “But the idea that it is sulfur, not dust, that causes winter impacts has become very popular in recent years ,” Ozgur Karatekin, a researcher at Belgium’s Royal Observatory, told AFP.
For this study, an international research team was able to measure dust particles thought to have originated after the asteroid hit. The particles were discovered at the Tanis fossil site in the US state of North Dakota. Despite being 3,000 kilometers (1,865 miles) from the crater, this site has housed a number of extraordinary finds that are believed to have come from an asteroid impact on the sedimentary layers of an ancient lake. headtopics.com
By plugging this data into climate models similar to those used on Earth today, the researchers concluded that dust likely played a much larger role in mass extinctions than previously thought.
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2023-10-31 01:53:14
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