e154 Aliens Could ‘Invade’ Our Solar System Using Tiny Robots and We Might Not Even Notice

It’s entirely possible, says Osmanov, that extraterrestrial beings could unleash a massive squadron of undetected microscopic probes across the entire galaxy, through clouds of interstellar gas which exist between star systems. Osmanov imagines that if the tiny mechanical probes landed on a rocky planet, it would have the resources needed to continuously reproduce the energy and resource-efficient micro-robots.