Lunar regolith thickness deduced from concentric craters in the CE-5 landing area

Abstract Lunar regolith is the layer of fragmented and unconsolidated rock material that is repeatedly stirred and overturned on the lunar surface. It can provide critical information about lunar geologic processes (e.g., impact, volcanism) and the space environment. China's Chang'E-5 (CE-5) mission, which will be launched in 2019, will land on the lunar near-side surface and return at least 2 kg of lunar regolith through surface collection and by boring a hole no