Rock core from dinosaur-killing impact reveals how enormous craters form
from Scientific American
Drilling into ground zero of the asteroid impact that killed off the dinosaurs 66 million years ago has uncovered the origin of its mysterious ring of mountains. The drill core penetrated a circle of mountains, known as a peak ring, in Mexico's buried Chicxulub crater. Only the largest impacts are powerful enough to form peak rings. Understanding how these mountains formed at the 200-kilometre-wide Chicxulub could help to reveal how cosmic collisions shaped other bodies, such as the moon and Venus.
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