"Now, I don't believe there are aliens visiting us as there is no evidence when there should be a lot. But I have very little doubt that we are not alone in the universe, just need the proof."
I would imagine that if there were space aliens visiting, they would probably have decided that drone/robotic explorations might make the most sense as we have and probably have made them tiny so as to use as little power as possible...
They could be lost in the normal swarm of tiny insects that constantly swarm around us...
Just and idle speculation...
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