Are there relic alien spacecraft on asteroids close to Earth that may have been observing the planet for longer than humans have existed?
A thought-provoking, if unlikely-sounding new theory that near-Earth “companion” asteroids may contain live or ancient robotic probes sent from faraway civilizations comes from Dr. James Benford at Microwave Sciences in Lafayette, California, whose paper "Looking for Lurkers: Co-Orbiters as SETI Observables," is published this week in the Astronomical Journal.
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https://www.forbes.com/sites/jamiecartereurope/2019/09/21/are-we-being-watched-ancient-extra-terrestrial-probes-may-lurk-on-earths-pet-asteroid/#5bdbeb6746e1