Xenolinguistics (also called xenolinguistics and astro linguistics) is the hypothetical (and fictional) study of the language of a̳l̳i̳e̳n̳ species. The nature and form of such languages remains purely speculative because so far no search for e̳x̳t̳r̳a̳t̳e̳r̳r̳e̳s̳t̳r̳i̳a̳l̳ intelligence projects have detected signs of intelligent life beyond Earth.
The possibility of future contact with intelligent e̳x̳t̳r̳a̳t̳e̳r̳r̳e̳s̳t̳r̳i̳a̳l̳ life has made the question of the structure and form of potential a̳l̳i̳e̳n̳ language a topic of scientific and philosophical discussion.,
In addition to creating academic debate, the potential nature of an a̳l̳i̳e̳n̳ language has also been tackled by science-fiction writers. Some have created fictional languages for their characters to use; others have circumvented the problem by proposing translation devices like the universal translator, or by creating universal languages that all involved species can speak.