The phrase encompasses two distinct, but usually intertwined, ideas: unidentified aerial phenomena and purported aliens. The previous refers to visible anomalies noticed within the ambiance that can’t be instantly defined, whereas the latter describes hypothetical life kinds originating from past Earth, generally depicted as diminutive, green-skinned humanoids in widespread tradition.
The persistence of those ideas in public consciousness is pushed by a mixture of things, together with real astronomical observations, psychological predispositions, and cultural narratives. Historic accounts, from historic folklore to modern-day sightings, have fueled hypothesis concerning unexplained occasions within the sky and the opportunity of encountering life past our planet. The topic additionally faucets into elementary human questions on our place within the universe and the potential for contact with different civilizations.