11 Traits All Aliens Probably Have According to Science

aliens traits

What features, according to scientists, would visitors from outer space have? In recent decades, as mankind endlessly talks about alien life, it seems that the time and duration of this contact is one of the most important issues occupying our minds. Books, movies and music dedicated to aliens demonstrate that the interest in the subject does not disappear, and over the years, the ideas about alien appearance, abilities and technology become more and more abundant. Some of these ideas are absolutely fictional, while some other are based on scientifically sound assumptions suggested by their authors.

1. Aggressiveness

The main distinctive trait of Homo sapiens separating them from other species has always been their aggressive behavior directed towards the species at lower levels of the evolutionary ladder. Adaptation during evolution and struggle for survival allowed us to become the most successful creature in nature. If we ever make a contact with extraterrestrial visitors, it is possible that aliens will think of themselves as the dominant race and treat us only as a resource, that is – the same way we treat, for instance, draught-work animals.

According to the article recently published by the University of Missouri, aliens will likely belong to a much advanced level of development and, in order to explore abilities and the level of development of human race, they will initially need to adopt an aggressive or offensive strategy, which would not necessarily have to be in the form of armed invasion.

2. Curiosity to explore

Any alien life form that has reached Earth, by definition, must have some kind of drive or curiosity to explore. Most likely, the curiosity of intelligent beings from other planets toward Earth will be similar to the interest that Christopher Columbus, Vasco da Gama, Marco Polo and other great travelers and explorers had.

According to physicist Stephen Hawking, although aliens are unlikely to destroy our planet – it is more likely that they will try to use its resources they may be in need for – mankind could still be affected by adverse impacts, similar to what the Aztecs had experienced when the Spaniards decided to force them to live according to European civilization’s rules.

3. Immunity to earthly diseases

Sci-fi literature and motion pictures often assume that aliens can never conquer Earth because their immune system will be extremely vulnerable to Earth’s viruses and bacteria. Indeed, in case of the aboriginal race and the conquistadors, this is exactly what happened – the Spaniards became exposed to syphilis and other diseases of the Americas, which caused epidemics with a considerable fatalities caused to the population of Europe.

According to Seth Shostak, the «SETI» Project manager, Earth’s viruses are unlikely to cause any harm to aliens because germs and bacteria which are dangerous for humankind have evolved in the course of millions of years to adapt to live inside humans. Earth’s bacteria and viruses rarely spread even among different types of species (e.g. influenza virus is absolutely harmless in dogs), and the structure of alien organisms is likely to be fundamentally different from the structure of a human body, therefore bacteria simply will not “understand” how to survive in aliens.

4. Aliens are unlikely to prey on humans

For thousands of years, the mankind has been preying on other inhabitants of our planet and even breeds animals to be later “slaughtered”. The idea that aliens can do the same to humans instills horror and desire to resist any potential alien invasion to the last drop of blood.

alien appearanceNevertheless, it is unlikely that human flesh will satisfy the discriminating taste of alien palates. Most likely, while preparing for a long journey, aliens will provide themselves with an ample supply of food and have the ability to produce more food, so they do not have to prey on humans. In addition, protein-based food from Earth is unlikely to be compatible with the digestive system of guests from other planets, which is another argument in favor that space travelers will have their own food with them.

Advanced civilizations have always come to conclusion that hunting and livestock are not the most effective methods of food production, so there will be no steaks from human flesh on the tables of hungry aliens.

5. Aliens are ruthless killers

You might have been in a situation when after renting or buying a house, you find cockroaches hiding inside one of the kitchen corners. Your further actions are easy to predict: first you violently exterminate defenseless and, by and large, harmless insects, then set traps everywhere and use chemicals to kill these insects, taking all measures possible not to share your living space with unwanted “pets”.

Similar terrible fate may befall humans. From the aliens’ point of view, human race may be something similar to parasitic insects, and the new rulers of the planet may resort to a large-scale cleanup, after which they can start using the Earth’s resources. To get rid of human parasites on the planet, bacteriological, climatological or some other unknown to mankind weapon may be used.

6. Aliens are not insects!

Writers of horror movies and science fiction authors sometimes imagine alien invaders as humongous insect-like creatures. Aliens that look like giant beetles and wasps are probably the most terrifying and hideous creatures conceived by the human mind, but the scientific point of view dictates that such an assumption about the appearance of aliens is unsubstantiated. Rather, these representations reflect people’s fear of insect carriers of deadly diseases on Earth.

Due to the specific structure of insects’ bodies, the range of comfortable living conditions for them is rather narrow. Insects do not have blood, so they cannot get sufficient amounts of oxygen from the atmosphere; that is why they are so small. Many millions of years ago, when the concentration of oxygen in the atmosphere was much higher, the size of some insect species reached one meter, but these giants quickly became extinct, giving rise to more adapted and self-efficient species.

7. Super-intelligence

You probably noticed that almost all aliens in books and movies are super-intelligent. This makes sense, otherwise how would they be able to travel in space or try to take over another planet? However, aggression and bloodlust, which are usually attributed to aliens, just do not fit with the image of aliens as highly-intelligent beings.

If an alien civilization is in the advanced stage of socio-political, scientific and technological development, it is unlikely that its members would simply start a world war; this may bring more problems than benefits. Alien mission will likely be not a military operation, but an invitation to a dialogue. Politicians from Earth and alien leaders will have to seek compromises and come up with ways for mutually- beneficial cooperation, while preventing a bloodshed.

8. Non-humanoid look

No matter how wild or daring human imagination is, the look of fictional aliens is generally portrayed as resembling human body. It allows filmmakers to create much more colorful and convincing scenes of interaction between humans and aliens. When a “green man” is at least somewhat similar to an earthling, it makes us more sympathetic towards it, as opposed to towards creatures that look like a bowling ball (this particular look of aliens can be found in one of the novels by famous science fiction writer Clifford Simak).

Still, Simak’s visions are somewhat true in a sense that aliens could certainly be strikingly different from common animal species inhabiting Earth. The look of any living being depends primarily on the environmental conditions, and we know little about climatic conditions of inhabitable planets in other galaxies, so if a contact with their inhabitants takes place, it will be a big surprise for mankind to see what they may look like.

9. Communication abilities

The level of development of any civilization is largely determined by the level of advancements in communication. Technological and social progress of recent decades has allowed to take information exchange among humans to a completely different level, information became a highly valued commodity and with every year there is a growth in the volumes of data transmitted. Every day, people have to solve a lot of problems associated with language barriers and the ways of thinking in different countries, but in general, any individual on Earth would be able to communicate with someone from another country or continent using, for example, gestures or pictures.

If aliens visit Earth, primarily to build relationships with people, they (and we) will need to come up with a method of information exchange which is accessible, acceptable and understandable for all involved in the interplanetary dialogue. It seems to be complicated further because we have no idea how aliens communicate with each other. So an invention of, for example, a translating device from English into some alien language may become very problematic because aliens may use electromagnetic waves or telepathy to communicate.

10. Do not expect to be visited by alien “bodybuilders”

alien appearanceMany fans of films and books about aliens will surely be disappointed after finding out that burly, strong and devilishly clever alien monsters, envisioned by some of the writers and creators of these films, most likely do not exist.

When a civilization reaches advanced levels of technological development, physical development of its members gradually slows down. For example, in order to survive, our ancestors had to have strong muscles and agility, but many people today prefer not to bother themselves with physically demanding activities, because they do not need to hunt a mammoth to find food.

With the increasing energy efficiency of the body, the number of muscles has been steadily decreasing, simultaneously compensating this by the development of the brain. This phenomenon, in particular, was mentioned by Herbert Wells in his famous “The War of the Worlds“, and his Martians had extremely well-developed brain, but the body was mainly adapted to manipulate buttons and levers to control various devices, such as combat tripods described in the novel.

11. Functional limbs

Notwithstanding the fact that aliens are most likely to be lacking considerable physical strength, they would probably still have one or more limbs, with functionality similar to a human hand. In order to achieve certain advanced levels in science and technology, intelligent beings must be able to manipulate tools and equipment with dexterity, and for this they need truly “capable hands”, i.e. limbs capable to perform accurate and carefully planned movements.

Tools are being constantly improved, their handling becomes more simplified, and their capabilities expand, but this does not always lead to degeneration of skills related to fine manipulation of objects. For example, spears and swords are rarely used nowadays as weapons, they are replaced by nuclear warheads and drones, but every adult knows how to use them, even though not to perfection.

Based on the article from listverse.com

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I'm a law student who is fond of reading and writing about interesting topics on science (especially cognitive science and psychology), technology, and different extraterrestrial and paranormal stuff. I'm passionate about movies, travelling and photography.


  1. Cristi Constantin May 20, 2014 at 4:29 pm - Reply

    Very nice article and nicely documented.
    I think that most of the things in here are a very “humanly”, limited thinking. Aliens will most likely be so different that we cannot comprehend. If we would be invaded, we will most probably don’t even know it.

  2. George E Moss May 20, 2014 at 5:41 pm - Reply

    Forgive me if I smile at the idea of a ‘learned discussion of mere possibilities’ when we already have so much actual factual data concerning so-called aliens. But the article does have two redeeming features—firstly, acknowledgment of the aggressive behavior of Homo sapiens (which sadly colors our outlook towards others), and secondly, acknowledging telepathy as one possible means of extraterrestrial communication.
    Factual Data: Telepathy is indeed a much favoured method of communication between planetary beings of this universe. Brain is a biological computer with capability to download thought-behind-words to its known language; thus overcoming language barrier. Mind / thought / telepathy are exterior to space-time and act instantaneously; so there are no significant time delays. Absence of language problem and the absence of time delay make telepathy a much favored means of communicating. The Kingsclere Group—a dedicated UK séance group, guided by Salumet of Angelic Realms—has had communication with sentient beings of other planets for the past ten years and has recorded, transcribed and published all conversations. The guided Kingsclere Group includes full-trance and partial trance mediums, clairvoyants, scientists and teachers. The group is not funded or promoted by any institutional body and currently is therefore quite understandably shunned by news media and by mainstream science. This exclusion policy will change in due process.
    Extraterrestrial Visitors: There are many variations of physical form, from ‘mushroom’ to fish-like with a number of ETs being bipedal rather like ourselves. Some are larger, some smaller, some hairy and blond, some less dense, but always their important development is MIND—without evolved mind and the abilities that go along with that development, none would be able to space-travel. Many space-travellers are interested in the progress of humanity and have visited Earth. The bipeds with three-fingered hands, inscribed on the Atlatl rock in the Nevada Desert, for example, came from a planet that they know as ‘Crogaria’. The first task of many visitors to Earth has been to construct a large pyramid, using their own methodology—this to produce energy needs whilst here and to assist their return journey. Early pyramids are hard evidence of their visits and have been radio-carbon dated to as far back as 30,000 years. We owe a huge debt of gratitude to Russian scientists (Profs Golod and Krasnoholovets) for constructing glass-fiber pyramids and studying the astounding effects of pyramid-generated energies; also to Dr Sam Semir Osmanagich for his valuable excavation work and study of the Bosnian Valley of Pyramids, and for his collaboration with European and Russian analytical laboratories. Following the visit of three members of the Kingsclere Group to the Bosnian Pyramids in October 2013, Dr Osmanagich has kindly contributed details of his ongoing project to our above named new title.
    These are exciting times of change. Old standards have had their day, and mankind’s early history needs re-writing; hence the understandable reluctance of scientific institutions, world governments and attendant news media to account new criteria. The truth now emerging carries with it the prospect of wondrous cosmic alliance, in the midst of which good will prevails. It is time to acknowledge that we have real friends out their—and they are well beyond the mentality of mining our minerals and plundering our planet!

  3. Melder May 26, 2014 at 7:04 am - Reply

    1) things like Alien’s food is at most a projection of imagination by us homo sapiens based on our own structure, does all species necessarily need external supplies of sustaining resources? Are all species necessarily have flesh even. Think of a life form in the form of….let say, plasma energy or gamma ray.

    2) When a species who could travel across the world to found us, it is unlikely that they will show themselves before they thoroughly study us as fluidity substance for this planet (just like cells and bloods for our body).

    3) IF, they are refuge from a planet with conditions like ours, first thing we knew is that they already has the technology to study us at the first place, secondly, it wouldn’t be difficult for them to eradicate us, thirdly, as much as I hate to say this, a species this advanced will avoid conflicts with environment at all cost, the evolutions of life form on earth are basically evolving to adapt mother earth, we human abandon such path and went on a path named Science, and the direction we pursuit in science were nothing more than infant age in the eyes of universe, we are still trial and error, using technology to fuel the incapabilities of our species, instead of allowing evolution to take place, I call this artificial evolution. With such in mind, they will not be like us burning forest just so we can build home, instead, they will adapt a way to live amongst us, the scenario in MIB is more likely imo. Perhaps, they’re already around us in a form we could not comprehend. Many weird stuff happen in the world on daily basis hasn’t it? 🙂

    4) When a group of scientists step foot into a tribal clan in wild forest, will they proceed to exterminate them? no. What will they first do? Show peace. This is the common sense of our level of intelligent, we could safely assume that they will want to show peace and make contact. With technology that traverse across the world, it wouldn’t be surprising that each of them has the ability to manipulate homo sapiens around them to be unable to see them or see them as another human being. It is another way of living amongst us without interruptions.

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11 Traits All Aliens Probably Have According to Science