An image of the Chicxulub crater, on the northern coast of the Yucatán Peninsula in Mexico, was generated on a computer from gravity and magnetic-field data. The buried structure, which measures at least 112 miles (180 kilometers) across, is thought to be the scar remaining from the impact some 65 million years ago of an asteroid or comet measuring perhaps 6 miles (10 kilometers) in diameter. The Yucatán coastline bisects the crater through its center.
© V.L. Sharpton, University of Alaska, Fairbanks; NASA