Ping
After analyzing the minerals in six plots of soil at the bottom of the South Pole-Aitken basin, a team of researchers argues that the crater's composition is all crust and no mantle, suggesting that whatever impact opened the crater billions of years ago did not hit hard enough to spray the moon's innards onto the surface.
As you no doubt know, the theory that the Moon was formed from ejecta from the Earth at least used to assume that most of the ejecta was of crustal material, rather than mantle material. Have feet, will ping later. Thanks Army Air Corps.