A giant asteroid impact crater has been found under Greenland's Hiawatha Glacier. Advanced radar revealed the enormous structure. Scientists analysed meltwater sediments, finding shocked quartz and ...

Melting glaciers and polar ice sheets are among the dominant sources of sea-level rise, yet until now, the water beneath them has remained hidden from airborne ice-penetrating radar. With the ...

Scientists have discovered a possible second impact crater buried under more than a mile of ice in northwest Greenland. This follows the finding, announced in November 2018, of a 19-mile-wide crater ...

Maps showing the location of the Hiawatha impact crater in northwest Greenland (left) and the shape of Earth’s surface beneath the ice, with the crater clearly visible (right). CREDIT University of ...