PT  - JOURNAL ARTICLE
AU  - Li, Chunlai
AU  - Su, Yan
AU  - Pettinelli, Elena
AU  - Xing, Shuguo
AU  - Ding, Chunyu
AU  - Liu, Jianjun
AU  - Ren, Xin
AU  - Lauro, Sebastian E.
AU  - Soldovieri, Francesco
AU  - Zeng, Xingguo
AU  - Gao, Xingye
AU  - Chen, Wangli
AU  - Dai, Shun
AU  - Liu, Dawei
AU  - Zhang, Guangliang
AU  - Zuo, Wei
AU  - Wen, Weibin
AU  - Zhang, Zhoubin
AU  - Zhang, Xiaoxia
AU  - Zhang, Hongbo
TI  - The Moon’s farside shallow subsurface structure unveiled by Chang’E-4 Lunar Penetrating Radar
AID  - 10.1126/sciadv.aay6898
DP  - 2020 Feb 01
TA  - Science Advances
PG  - eaay6898
VI  - 6
IP  - 9
4099  - http://advances.sciencemag.org/content/6/9/eaay6898.short
4100  - http://advances.sciencemag.org/content/6/9/eaay6898.full
SO  - Sci Adv2020 Feb 01; 6
AB  - On 3 January 2019, China’s Chang’E-4 (CE-4) successfully landed on the eastern floor of Von Kármán crater within the South Pole–Aitken Basin, becoming the first spacecraft in history to land on the Moon’s farside. Here, we report the observations made by the Lunar Penetrating Radar (LPR) onboard the Yutu-2 rover during the first two lunar days. We found a signal penetration at the CE-4 landing site that is much greater than that at the CE-3 site. The CE-4 LPR images provide clear information about the structure of the subsurface, which is primarily made of low-loss, highly porous, granular materials with embedded boulders of different sizes; the images also indicate that the top of the mare basal layer should be deeper than 40 m. These results represent the first high-resolution image of a lunar ejecta sequence ever produced and the first direct measurement of its thickness and internal architecture.