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According to scientists who maintain that dinosaur extinction came quickly ... blasted into Earth by a 10-kilometer-wide asteroid or comet traveling 30 kilometers per second -- 150 times faster ...

Did dinosaurs lose their dominance suddenly or ... Although geologists generally acknowledge that a comet or asteroid impact would cause these fractures, some scientists conclude that they could ...

At the start of the period, dinosaurs ruled the loosening remnants ... Whether or not the asteroid or comet that carved the Chicxulub crater caused the extinction of more than half the planet's ...