Li Chunlai, Su Yan, Pettinelli Elena, Xing Shuguo, Ding Chunyu, Liu Jianjun, Ren Xin, Lauro Sebastian E, Soldovieri Francesco, Zeng Xingguo, Gao Xingye, Chen Wangli, Dai Shun, Liu Dawei, Zhang Guangliang, Zuo Wei, Wen Weibin, Zhang Zhoubin, Zhang Xiaoxia, Zhang Hongbo
Key Laboratory of Lunar and Deep Space Exploration, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Sci Adv. 2020 Feb 26;6(9):eaay6898. doi: 10.1126/sciadv.aay6898. eCollection 2020 Feb.
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.
2019年1月3日，中国的嫦娥四号成功着陆于南极-艾特肯盆地内的冯·卡门撞击坑东端，成为历史上首个在月球背面着陆的航天器。在此，我们报告玉兔二号巡视器搭载的月基穿透雷达（LPR）在前两个月球日的观测结果。我们发现嫦娥四号着陆点的信号穿透深度远大于嫦娥三号着陆点。嫦娥四号LPR图像提供了清晰的地下结构信息，地下主要由低损耗、高孔隙率的颗粒物质组成，并嵌有不同大小的巨石；图像还显示月海基层顶部深度应超过40米。这些结果代表了有史以来首张月球喷出物序列的高分辨率图像，以及对其厚度和内部结构的首次直接测量。
