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> By what mechanism could they even be hiding? Every inch of the planet is being watched by satellites.

As well as ground based cameras, radar systems, infrasonic, particle detectors, scientific instruments, etc. And how would these ships power themselves for so long. To be able to do so while being hidden from xray, visible light, infrared, and radio? Except for maybe a few of these random sightings? Sure, it is possible, but doesn't sound likely.




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