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Where is the asteroid that killed the dinosaurs? Has it ever been found? It has actually. There's a crater off the Yucatan Peninsula, the east coast of Mexico. That's about 110 miles across and 12 miles deep. In 1991, scientists knew, but actually, petroleum companies knew about it since the 70s. And they didn't tell anyone because they're companies. How do we know killed the dinosaurs? Well, dinosaurs dominated terrestrial ecosystems for 165 million years. And then we see this impact layer, the fallout asteroid. And nowhere has anyone found a single dinosaur fossil one centimeter this layer. We can see that in history, when poof, they were gone. The asteroid that wiped out the dinosaurs was about 18 kilometers across, traveling 45 times the speed of a bullet. Probably landed in the springtime. Dakota, some fossil fish that have spring pollen in their gills.