Cognition
Exploring Extraterrestrial Language
What might alien languages be like—and why should we care?
Posted April 7, 2026 Reviewed by Hara Estroff Marano
Key points
- Deep down, human languages are more similar than different.
- Speculating about alien languages means thinking beyond human cognition and human biology.
- Alien languages may end up being more similar to human languages than we might expect.
Long before Artemis II captured our attention by taking humans farther from Earth than ever before, humans have been fascinated by the possibility of exploring other worlds, finding life on other planets, and communicating with extraterrestrial beings. In fact, there’s even a subfield of linguistics, the study of human language, dedicated to the study of alien language: xenolinguistics.
It may seem surprising that researchers could study a phenomenon for which we don’t yet have any data—after all, there are no verified accounts of conversations with aliens. But there are good reasons to consider what alien languages might look like.
What Makes Language "Language"?
For one, in thinking about the nature of extraterrestrial languages, we need to think about what human languages are like. One central—and amazing—fact is that human languages have far more in common than we might think. A universal grammar underlies what turn out to be mostly surface differences.
For example, all languages use a finite number of sounds (or gestures in the case of signed languages) and phrase types (like noun phrases and verb phrases) to build a theoretically limitless number of unique communications, from text messages to philosophical treatises.
Humans are also able to communicate not only about the physical world but about things beyond our immediate senses, such as the past, the future, and imagined alien worlds.
And human languages are passed down from parent to child. They’re cultural inventions, not instinctive behaviors.
Animal communications, on the other hand, are mostly instinctive and are far more limited: Animals convey messages about food, territory, mating, and a few other topics, and they indicate emotions like aggression and affection, but that’s about it—at least as we currently understand them.
Human Brains + Human Bodies = Human Language
Perhaps an even more interesting question than what’s common to all human languages is why, deep down, they’re all so similar. A big part of it is that language is shaped by human cognition and biology—their structures and their limits.
Our brains give us the ability to build complex sentences from simpler parts, and our bodies give us tools for producing verbal and signed language. There’s no reason why an alien species with a different type of brain couldn’t organize sentences differently—maybe as swirls rather than hierarchical structures, or why they couldn’t send meaningful signals via chemical, light, electromagnetic, or radio signals.
In fact, even on our own planet, there are beings that communicate via such alternate channels: Ants lay down chemical trails, sea creatures send messages of aggression and submission using light and color, and eels and some other fish emit electrical communications, including navigational signals to keep them from running into each other.
"Alien" Languages Invade Hollywood
In addition to advancing language science, thinking about extraterrestrial languages also keeps us entertained. Invented alien languages like Klingon and Vulcan have played a big part in movies and television, even though the languages are actually pretty human-like: They’re still transmitted via mouth, picked up by ear, and made up of sentences, phrases, words, consonants, and vowels—even if the sounds and words are weird.
A few invented languages reach farther—for example, the tentacle tracings of the aliens in the 2016 movie Arrival—but most are pretty anthropomorphic.
Hollywood has also tended to gloss over the question of how humans might understand alien communications. The crew of the Starship Enterprise uses a convenient Universal Translator; human-alien communication in Star Wars happens via a universal language, Galactic Basic (a.k.a. english); and there’s a "babel fish" that does the translating in The Hitchhikers Guide to the Galaxy.
Messaging Extraterrestrial Intelligence
Real-life scientists seeking communication with extraterrestrials, like those working with METI, the international research effort for Messaging Extraterrestrial Intelligence, know that interpreting alien languages is likely to be a far more complicated matter than science fiction would have us believe.
Some speculate that alien languages might be so different from any of our own that we might not even recognize them as language when we see them, let alone be able to understand or answer them. Beings whose brains and bodies are vastly different from our own will probably structure language quite differently and convey it via different channels, perhaps magnetic fields, odors, or even telepathy.
Another problem is that humans use human language to communicate about our earthly surroundings and our inner lives and to bond with fellow humans caught up in the same types of surroundings, thought processes, and emotions. We don’t know, and perhaps can’t even imagine, what types of distant worlds and ways of viewing them aliens will want to talk about if they ever reach out to us.
The Ties that Bind
That being said, it may be that alien language will turn out to be more similar to human language than we might think.
After all, the more we learn about non-human communication here on Earth, the more we realize we have in common with animals: Bees communicate about distant food sources, cephalopods pretend to be other animals, or even plants and rocks, and some non-human primates do seem to lie—or at least to conceal food sources.
Marvin Minsky, a pioneer in the development of AI (which is rapidly becoming another non-human language we don’t fully understand), once noted that communication with alien intelligence should be fully possible, since all creatures in the universe are bound by the same constraints on matter in space and time, no matter what planet we may be from.
That’s a comforting thought for those hoping one day to communicate with galaxies far, far away—or simply to better understand our neighbors right here on Earth.
