Dear universe: One dinosaur-killing asteroid just wasn’t enough?
“The idea that [Chicxulub] had help — for want of a better phrase — would have really added insult to serious injury,” says study coauthor Veronica Bray, a planetary scientist at the University of Arizona in Tucson.have been discovered on Earth , the vast majority of which are on land. That’s because impact craters at sea gradually become buried under sediment, Bray says, which makes the Nadir structure a valuable scientific find, regardless of its birthdate.
Based on the structure’s dimensions, Bray, Nicholson and their colleagues calculate that, if an asteroid was responsible for the terrain, it would probably have been over 400 meters wide. What’s more, the researchers estimate that the impact would have rocked the ground like a magnitude 7 earthquake and stirred tsunamis hundreds of meters high.
Using geologic layers adjacent to Nadir, some with ages obtained by past studies, the team estimated the structure to have formed around the end of the Cretaceous period — 66 million years ago. The Nadir asteroid may even have formed a pair with the Chicxulub asteroid, the two having been ripped apart by gravitational forces during a previous Earth flyby, the researchers speculate.
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