A second asteroid may have crashed into Earth as the dinosaurs died

A dimple in the Atlantic seafloor could be the sign of another impact.

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Nicholson hunted for other ways to explain the dimple—escaping methane bubbles, tectonic activity, or a volcano. But none of them quite explained the crater’s size, location, and shape. So he turned to cosmic impact experts for help. “Probably every week, somebody sends me circles they spotted on Google Earth, or in seismic data,” says Sean Gulick, an expert in meteor strikes at the University of Texas Institute for Geophysics, and a coauthor on the research.

Ludovic Ferrière, an impact crater expert from the Natural History Museum Vienna who was not involved in the work, agrees that the shape of the feature is interesting and warrants further investigation—but he’s skeptical of the decision to publish on the basis of seismic images alone. “It’s a very nice proposal,” he says. “”But it’s too preliminary. At the end they may be right, but they may be completely wrong.

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