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A close-up, overhead view of reddish-brown Martian soil taken by the Curiosity rover. In the center is a distinct, circular area where the top layer of rough soil has been smoothed or brushed away, leaving faint concentric ring marks. A small, elongated rock fragment is embedded in the very center of this circular patch. The brushed circle contrasts with the surrounding undisturbed surface, which is covered in loose, coarse sand and small, crumbly pebbles.

A close-up, overhead view of reddish-brown Martian soil taken by the Curiosity rover. In the center is a distinct, circular area where the top layer of rough soil has been smoothed or brushed away, leaving faint concentric ring marks. A small, elongated rock fragment is embedded in the very center of this circular patch. The brushed circle contrasts with the surrounding undisturbed surface, which is covered in loose, coarse sand and small, crumbly pebbles.
A close-up, overhead view of reddish-brown Martian soil taken by the Curiosity rover. In the center is a distinct, circular area where the top layer of rough soil has been smoothed or brushed away, leaving faint concentric ring marks. A small, elongated rock fragment is embedded in the very center of this circular patch. The brushed circle contrasts with the surrounding undisturbed surface, which is covered in loose, coarse sand and small, crumbly pebbles. 图：NASA
许可证
NASA Image and Media Guidelines
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