The Moon is a natural archive that has been collecting cosmic dust for billions of years. Among the microscopic grains that arrived from distant stars, there could be techno-specks — particles created by alien civilizations. Such tiny messages can indeed reach our satellite: particles made of durable material, rich in carbon or metals, travel for up to a billion years. Sunlight works like a sieve: it discards those too light or too fast, letting only the right-sized ones through. On the Moon, they don't burn up in the atmosphere but mix with the lunar soil. To read these pages of cosmic history, scientists propose a two-step search: computer vision sorts out ordinary dust grains, and spectral tests reveal chemical anomalies. If not a single alien particle is found in a cubic meter of soil, it would mean that stars like our Sun over the entire history of the Galaxy haven't scattered more than a tenth of Earth's mass as tech junk. This approach turns the Moon into a detector of technological epochs from other worlds with advanced technology.