Unidentified flying objects (UFOs) have captured the public's attention over the decades.
As exoplanet detection is on the rise, why not consider that star-hopping visitors from afar might be buzzing through our friendly skies by taking an interstellar off-ramp to Earth?
On the other hand, could those piloting UFOs be us — our future progeny that have mastered the landscape of time and space?
Perhaps those reports of people coming into contact with strange beings represent our distant human descendants, returning from the future to study us in their own evolutionary past.
It is likely that humans of the distant future could develop the knowledge and machinery necessary to return to the past.
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https://www.space.com/aliens-time-traveling-humans-ufo-hypothesis.html