Meteorites give the Moon its extremely thin atmosphere
Briefly

The findings indicate that micrometeorite impacts vaporize lunar soil, releasing potassium and rubidium atoms into the Moon's exosphere and providing essential insight into its atmospheric composition.
The research highlights that over geological timescales, micrometeorite impacts are the primary source of atoms that constitute the Moon's very tenuous atmosphere, continuously being replenished.
The LADEE mission findings revealed that the lunar atmosphere increases in density during meteor showers, highlighting the direct influence of meteorite impacts on atmospheric composition.
The study emphasizes the importance of isotopic analysis to understand the conversion mechanism of impact energy into a diffuse lunar atmosphere, particularly focusing on potassium and rubidium.
Read at Ars Technica
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