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Have aliens sent mechanical emissaries to our solar system -- robotic probes on a snoopy mission to reconnoiter Earth?
It’s certainly an intriguing idea: sophisticated spy satellites from light-years away monitoring our planet, watching the slow evolution of life, and reporting back to their alien masters. Such a scenario has frequently appeared in the SETI literature, and Allen Tough, at the University of Toronto, has urged that we take the idea seriously enough to make a search for these alien "bugs. [continued]
http://space.com/searchforlife/seti_alien_shostak_040122.html
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