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Asteroid that eradicated dinosaurs not a one-off, say scientists – The Guardian

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Asteroid that eradicated dinosaurs not a one-off, say scientists  The GuardianNadir crater: The asteroid that killed the dinosaurs was not alone  BBC.com3D anatomy of the Cretaceous–Paleogene age Nadir Crater  Nature.comFive-mile asteroid impact crater below Atlantic captured in ‘exquisite’ detail by seismic data  Phys.orgTwo Asteroids, One Dinosaur Extinction: Second Crater Bolsters Double Impact Theory  Gizmodo