KNOWLEDGE / OTHERWORLDY / ALIEN
Extraterrestrial life, or aliens, refers to life originating outside Earth, which, despite widespread belief in its probability due to the sheer scale of the cosmos, has not yet been scientifically detected. While popular culture imagines humanoid visitors, scientists, including many in astrobiology, focus on identifying microbial life or technosignatures (radio signals, industrial pollutants) on distant exoplanets.
