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Using nickel isotope analysis on impact clay collected worldwide, researchers confirmed the Chicxulub impactor was a CO chondrite โ a meteorite type so rare it makes up just a sliver of the already-uncommon 5% of meteorites classified as carbonaceous chondrites. Published this week in Science Advances, the study also finds the asteroid's low sulfur content means the mass extinction was driven mainly by dust blocking sunlight, not sulfur aerosols as long assumed. The rock may have originated from the outer asteroid belt near Jupiter. Does knowing the exact meteorite type change how we think about future impact threats?
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