希克蘇魯伯隕石坑
The team used gravity measurements by NASA's GRACE satellites to identify a wide mass concentration and noted that this mass anomaly is centered within a larger ring-like structure visible in radar images of the land surface beneath the Antarctic ice cap. That combination suggested to them that the feature may mark the site of a wide impact crater buried beneath the ice and more than 2.5 times larger than the Chicxulub crater.