Storyboard of an Extraterrestrial Monster –Greenland’s Hidden Hiawatha Impact Crater

  Buried beneath the Hiawatha Glacier is an ancient 31-kilometer-wide impact crater, left when an iron asteroid 1.5 kilometers across slammed into what is today Greenland, possibly within the past 100,000 years reports Paul Voosen in Science. Big enough to swallow Washington, D.C., the crater was detected by Kurt Kjær, a geologist at the Natural … Continue reading Storyboard of an Extraterrestrial Monster –Greenland’s Hidden Hiawatha Impact Crater