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UFO's are by definition " unidentified " so we don't know what they are and that's the point.
I do think some could be experimental aircraft and drones both foreign and domestic as well as natural aberrations, actually some sightings have been later proven to have been things like headlights at a distance bouncing off low clouds at a deceptive angle of observation.......but as far as little green men visiting, I doubt it.
We could see a long range probe from a distant advanced civilization where beings live a lot longer than we do and/or live much longer in effect due to time dilation, however due the the vast distances between the Earth and anywhere else where there could be life, only beings who can travel near the speed of light would even bother to come here and even then they would experience time dilation returning home to a much older world........maybe if there's an advanced civilization on Proxima centuari b which is 4.2 light years away, that means IF they could travel at 50% of the speed of light, it would still be a 17 year long round trip and 25 years would have passed on their home world when they returned, so yea, maybe they send a probe.
I do think some could be experimental aircraft and drones both foreign and domestic as well as natural aberrations, actually some sightings have been later proven to have been things like headlights at a distance bouncing off low clouds at a deceptive angle of observation.......but as far as little green men visiting, I doubt it.
We could see a long range probe from a distant advanced civilization where beings live a lot longer than we do and/or live much longer in effect due to time dilation, however due the the vast distances between the Earth and anywhere else where there could be life, only beings who can travel near the speed of light would even bother to come here and even then they would experience time dilation returning home to a much older world........maybe if there's an advanced civilization on Proxima centuari b which is 4.2 light years away, that means IF they could travel at 50% of the speed of light, it would still be a 17 year long round trip and 25 years would have passed on their home world when they returned, so yea, maybe they send a probe.