Do aliens already live on earth?

do aliens already live on earth?


British astronaut Helen Sharman thinks they could live among us undetected. Maybe in a microscopic niche, suggests an astrobiologist

Helen Sharman, the first British astronaut and the first astronaut to visit the Russian space station Mir in 1991, is firmly convinced that aliens exist. In an interview she also said that they could already possibly live undetected among us. It could well be that we simply can not see them. So they could be some kind of ghosts, spirits or angels that we don’t perceive with our senses because they are fundamentally encapsulated differently.

British astrophysicist and biologist Samantha Rolfe of Bayfordbury Observatory took up this idea of aliens imperceptible to us and considered in an essay how they could live on Earth without us noticing them. First, she addressed the difficulties of how life can be defined. There are more than 100 definitions, which also makes it difficult to search for or recognize aliens in space. If you don’t know what you are looking for, your search is naturally limited, especially if you are limited to life as we know it from Earth. And intelligent life, of course, does not have to look humanoid or at all similar to biological life on earth.


Life as we know it, according to Rolfe, is readily defined as MRS GREN: Movement, respiration, perception, growth, reproduction, excretion, and food intake. Others try to define physical-chemical minimum requirements like: Compartments, program, metabolism (metabolism), catalysis, regulation, growth, reproduction, adaptation/evolution. As you can see, there is no overlap, but only a partial overlap.

In any case, Rolfe tries to take up Sharman’s hypothesis and think about how it could be conceivable that non-terrestrial life could have already settled down without us noticing it. It is conceivable that aliens with a different biochemical structure live in a hidden biosphere. With a rough probability such life forms would be microscopic. Coarser unknown biochemical structures were of course not invisible ghosts, they could be seen even if one did not know what they were.

With microscopes naturally also tiny aliens can be discovered. So why they have not been found yet. Rolfe suggests that probably many microscopic life forms have not been discovered because only a small fraction of bacteria can be cultured in the laboratory. It would be possible to sequence the DNA of non-culturable bacteria, but then only to identify life as we know it, i.e. with DNA.

Silicon, which is also abundant on Earth, is often proposed as an alternative biochemistry to carbon-based life. Silicon is similar to carbon, but is heavier, less able to form long chains and strong compounds, and is solid at terrestrial temperatures rather than waterless. Silicon-based life forms could have originated on other planets, however, there are no indications for it, whereby it would be also difficult to discover such life forms, which do not resemble the terrestrial life.

Migrating life

Researchers have found that meteorites contain the nucleic bases adenine, guanine and uracil, as well as amino acids, which are formed from the molecules hydrogen cyanide, carbon monoxide and ammonia in the presence of water. From this RNA can be formed with the mineral schreibersite, which is also found in meteorites. The first life forms were probably based on RNA, only later life forms developed on the basis of DNA. It would be possible, as scientists with simulations found out, that the bases for RNA life were formed when splinters of meteorites with a radius of 40 to 80 meters hit the earth in tumpels.

Possibly in this way also new life could develop on the earth, as for example the hypothesis of the Panspermie fahrahrend the existing already from the space, on the other hand it could have come on many stony exoplanets with oxygen and water to the development of life. So it could be quite possible that extraterrestrial microscopic life has come to Earth, if one does not think anyway that intelligent aliens have already visited the world or visit it with or without UFOs and abductions without us recognizing them.

And the consequences?

But so far the only life we know is the earthly life. Rolfe thinks that as long as we do not know that there is life elsewhere in the universe, we should consider terrestrial life, the only one we know, to be of the utmost value and to be protected from "harmful contamination" protect, whether it is terrestrial or alien life. But this is a perverse idea, based on the idea that what is good is the way it is, which ultimately leads from the protection of nature to the protection of the homeland and culture, to the building of walls and to the protection against foreigners. It is also absurd to try that terrestrial spacecraft should not contaminate another planetary biosphere. This can be at the most a scientific demand to investigate autochthonous life and to create a "Original" to preserve.

If evolutionares, d.h. changing, mixing and adapting life is migratory and should or could have been brought to earth by meteorites and from there to other planets under favorable growth conditions, then it is not the immigration that is harmful, but at most conditions that harm life, whatever it is. Living beings on a different biochemical basis could coexist with terrestrial life if they need different resources, otherwise evolution provides for creative developments. The discussion about aliens, i.e., alien and invasive species, is directly interwoven with political ideas about what is native and what is alien.

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