This a recently found large crater in Antarctica, that was created by a 50 kilometres wide space rock 250 million years ago, and contributed to, or caused the Permian-Triassic extinction, the greatest mass extinction on Earth.
The crater is about 500 kilometres wide, and is now buried beneath 1 kilometre of ice. It was found by looking at differences in density that show up in gravity measurements taken with NASA’s GRACE satellites.
This combined image overlay is of gravity fluctuations and airborne radar in the Wilkes Land region of East Antarctica . The edges of the crater are coloured red and blue; a concentration of mantle material is coloured orange.