Lunar activity from recent gas release

@article{Schultz2006LunarAF,
  title={Lunar activity from recent gas release},
  author={Peter H. Schultz and Matthew Staid and Carle M. Pieters},
  journal={Nature},
  year={2006},
  volume={444},
  pages={184-186}
}
Samples of material returned from the Moon have established that widespread lunar volcanism ceased about 3.2 Gyr ago. Crater statistics and degradation models indicate that last-gasp eruptions of thin basalt flows continued until less than 1.0 Gyr ago, but the Moon is now considered to be unaffected by internal processes today, other than weak tidally driven moonquakes and young fault systems. It is therefore widely assumed that only impact craters have reshaped the lunar landscape over the… 

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TLDR
High-resolution images of Mercury’s surface from orbit reveal that many bright deposits within impact craters exhibit fresh-appearing, irregular, shallow, rimless depressions, which support the inference that Mercury‚s interior contains higher abundances of volatile materials than predicted by most scenarios for the formation of the solar system”s innermost planet.
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