In April 2014, researchers flew over a site in southwest Greenland to find that a sub-glacial lake had drained away. This photo shows the crater left behind, as well as a deep crack in the ice.

Spanning 25 miles in diameter, this crater is three times the size of the Grand Canyon, making it the largest known impact site in the U.S. and the 15th largest on Earth.

The pictures show Mercury's biggest impact crater, as well as a mysterious, boomerang-shaped lava flow. A third image shows Nathair Facula, a light-colored region left behind by volcanic eruptions ...

Map of the bedrock topography beneath the ice sheet and the ice-free land surrounding the Hiawatha impact crater. The structure is 31 km wide, with a prominent rim surrounding the structure.

The chemical makeup of mineral inclusions preserved in impact glass hints at the site of a missing impact crater.

In the new study, Katarina Rodiouchkina and colleagues used sulfur concentrations and isotopic compositions from new drill cores of impact rocks within the crater region, combined with detailed ...