Humans are not aliens in the scientific sense. They evolved on Earth through natural processes, sharing genetic heritage with other Earth species. However, some speculative hypotheses and studies entertain unconventional ideas, such as aliens possibly living disguised among humans or the concept of humans as "ancient aliens" from a distant time or place, but these are not mainstream scientific views.
Scientific Understanding of Humans as Earth-Originated Life
Genetic evidence strongly supports that humans evolved locally on Earth, sharing DNA similarities with other life forms like primates and many other species. This points to a continuous evolutionary lineage on Earth without requiring an alien origin for humans.
Speculative Ideas and Studies
Some studies and theories, including a controversial one from Harvard researchers, propose that highly intelligent aliens might be living among humans disguised as humans or that humans might be connected to ancient alien civilizations or time travelers. These ideas are more in the realm of conjecture and science fiction rather than established science.
Philosophical and Broad Perspectives
Humans have unique characteristics involving the generation and propagation of information (culture, technology) that could be seen metaphorically as an "alien" phenomenon in the biosphere due to its rapid impact, but this is a metaphorical and philosophical viewpoint rather than a biological fact.
In summary, from a scientific and genetic perspective, humans are not aliens; they are Earth-originated life forms. The "humans as aliens" notion remains speculative and lacks concrete evidence.
