UFO Ancient Alien Civilization Theory

The nearest known exoplanet, Proxima Centauri b, lies approximately 4.2 light-years from Earth. Given this immense distance, any hypothetical extraterrestrial craft observed in our vicinity would, by necessity, originate from a civilization capable of interstellar travel across vast spans of time and space. This immediately introduces a series of constraints that challenge conventional assumptions about such phenomena. First, if a craft traveled even a modest fraction of the speed of light, t...