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Moon 'milestone’: China's Yutu 2 rover discovers ‘unusual’ shard on lunar far side

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“Repeated impacts, stresses from thermal cycling, and other forms of weathering on the lunar surface would all tend to break down rocks into more-or-less ‘spherical’ shapes, given enough time.

“Think of how rocky beaches wear down stones to smooth, round shapes over time by repeated jostling in the waves.”

The NASA-affiliated lunar geologist added both the rocky shard and the “ridge” running near the rock’s edge indicate this rock is geologically young and emplaced recently.

He said: ”I would definitely guess an origin as impact ejecta from some nearby crater.



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