A 19-mile crater was found under the Greenland Glacier.
Research found a meteorite hit it at 12 miles per second (19.2 km/s) about 12,000 years ago.
A 19-mile crater was found under the Greenland Glacier.
Research found a meteorite hit it at 12 miles per second (19.2 km/s) about 12,000 years ago.