The rover's radar peers 1,000 feet (300 meters) below the lunar surface.
Now, the lower-frequency channel has discovered multiple layers in the upper 1,000 feet below the surface, which"likely indicate a series of basalt eruptions that occurred billions of years ago," according to the paperThe study was led by Jianqing Feng at the Planetary Science Institute in Tucson, Arizona. Together, the new and earlier studies combine to build a representation of the upper layers of the moon.
The paper presents evidence for five main layers, with at least three of them being made primarily of basalt. The researchers find that layers at shallower depths are not as thick as deeper down, suggesting that volcanic activity produced decreasing flows over time, as the moon's internal thermal energy that drove the volcanism died away.
The data used was collected between January 2019 and January 2022, during which the Yutu 2 rover drove around 3,280 feet across the lunar surface.
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