Opublikowano wyniki radarowej penetracji warstw podpowierzchniowych wykonanych przez YT-2. Łazik bardziej dogłębnie mógł się "wgryźć" niż jego poprzednik, co jest związane z różnicami lunologicznymi obu stanowisk badawczych.China’s moon rover revealed what lies beneath the lunar farsideBy Lisa Grossman 2 HOURS AGO
The Yutu-2 rover is using radar to probe the lunar subsurface (illustrated; the rover’s path from January to March 2019 shown in white double lines). So far, the rover has found three different subsurface layers: fine soil down to about 12 meters, coarser rock with boulders embedded in it up to about 12 meters below that, and sublayers of coarse and fine materials down to about 40 meters. What’s below that is a mystery, for now. C. LI ET AL/SCIENCE ADVANCES 2020Those layers were probably created by material ejected by successive impacts, the researchers say. The floor of Von Kármán crater is a smooth sheet of cooled lava from long-ago volcanic activity. But that lava has been pummeled repeatedly and covered up by material, called ejecta, that is scattered when objects like meteorites slam into the lunar surface and leave craters behind.(...)
“The subsurface structure at Chang’e-4’s landing site is more complex … and suggests a totally different geological context,” Su says. In fact, the lava basement of the Von Kármán crater may be too deep for Yutu-2 to sense at all, the researchers speculate. (...)
Chang’e-4’s view of the moon’s subsurface is different from its predecessors’. Chang’e-3 and its Yutu rover landed in Mare Imbrium on the nearside of the moon in 2013, and that rover’s radar was blocked by dense volcanic rock at a depth of just 10 meters or so (SN: 12/16/13). That’s probably because the nearside’s volcanic floodplains are closer to the surface than those on the farside. (...)
https://www.sciencenews.org/article/china-moon-rover-revealed-what-lies-beneath-lunar-farside-surfacehttps://advances.sciencemag.org/content/6/9/eaay6898.abstract
Wątek: Chang'e 4 (Przeczytany 177743 razy)