Found under the Hiawatha Glacier, a 300-meter-long and 31-kilometer-wide crater in Greenland.
According to NASA, the crater was formed after a 800-meter-long iron meteor hit northwest Greenland less than 3 million years ago, then covered the ice and hid it from sight.
It was a team of researchers from the Genetic Geological Center of the University of Copenhagen in the Danish Museum of History, which in July 2015 first discovered a crater.
Center Professor Kurt Kjaer has indicated that the crater is in excellent conservation, and that is surprising, as the glacier ice can quickly remove the impact marks.
He also noted that the impact could have occurred at the end of the last nuclear age, making him one of the youngest on the planet.