Scientists Link 3.5 Billion-Year-Old Asteroid Strike To Dawn Of Life On Earth
A small stone discovered in the sands of Mali is reimagining what we know about the early solar system. By examining this rare lunar meteorite, planetary scientists have mapped out a sequence of cosmic collisions that retell the history shared by Earth and the Moon.
Thanks (or no thanks) to plate tectonics, erosion, and volcanic activity on Earth, finding pristine physical evidence of what happened here billions of years ago is nearly impossible. To uncover our planet's earliest chapters, scientists must sometimes look to the Moon, a geologically quiet place where the lack of an atmosphere or weather acts as a permanent cosmic museum.
The meteorite, called Northwest Africa (NWA) 12593, is a lunar breccia, essentially a natural concrete formed when fragments of different rocks are fused together by extreme force. A research team at the University of Colorado Boulder subjected the stone to radiometric dating and chemical analysis, revealing...
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