Year in Review Earth

Greenland crater renewed the debate over an ancient climate mystery

Scientists disagree on what the find means for a controversial comet-impact hypothesis

Greenland crater illustration

BIG REVEAL  Ice-penetrating radar disclosed a possible crater under a Greenland glacier. This topographic map strips away the ice to show the 31-kilometer-wide crater.

Natural History Museum of Denmark, Cryospheric Sciences Lab/NASA Goddard Space Flight Center

By Carolyn Gramling

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