Interstellar transport models for 0.3-micron refractory particles indicate that a null detection in 1 m³ of lunar regolith excludes Solar-type stars dispersing more than ~0.09 Earth masses of long-lived artificial particulate debris over Galactic history.
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Micron-Scale Technosignatures: How a Cubic Metre of Lunar Regolith May Begin to Constrain the Number of Past Technological Civilisations in the Galaxy
Interstellar transport models for 0.3-micron refractory particles indicate that a null detection in 1 m³ of lunar regolith excludes Solar-type stars dispersing more than ~0.09 Earth masses of long-lived artificial particulate debris over Galactic history.