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Fermis Paradox: Where is ET?

CATEGORY 2: They do exist, but we see no evidence (cont)

3. They aliens choose not to interact with us, because:

c) It is dangerous to communicate

An alien civilization might feel it is too dangerous to communicate, either for us or for them. When very different civilizations have met on Earth, the results have often been disastrous for one side or the other. Even contact at a safe distance could lead to infection by computer code or by "new ideas". Perhaps prudent civilizations actively hide not only from us but from everyone, out of fear of other civilizations.

d) They are too alien

Another possibility is that alien intelligences differ too much from us Earthlings. Their minds may simply be too different to talk with human beings, to understand the concept of communication, or to even be interested in other lifeforms at all. Also, Carl Sagan speculated that an alien species might have a thought process much slower (or faster) than humans. It could require years to say even a simple phrase like "Hello". A message broadcast by that species might well seem like random background noise to humans, and therefore go undetected.

e) They are non-technological

It is not clear that a civilization of intelligent beings must be technological. If alien species do not develop technology, because it is difficult in its environment, because it chooses not to, or for any other reason, they will be very hard for human beings to detect. Intelligence alone, as opposed to life, is not necessarily visible across interstellar distances.

4. The aliens, or their representatives, are here unobserved

It may be that intelligent alien life forms not only exist, but are already present here on Earth. They are not detected because they do not wish it, human beings are technically unable to, or because societies refuse to admit to the evidence. Several variations of this idea have been proposed:

a) Carl Sagan and Iosif Shklovsky argued for serious consideration of "paleocontact" with extraterrestrials in the early historical era, and for examination of myths and religious lore for evidence of such contact.

b) It is possible that a life form technologically advanced enough to travel to Earth might also be sufficiently advanced to exist here undetected. In this view, the aliens have arrived on Earth, or in our solar system, and are observing the planet, while concealing their presence. This is what many UFO followers has believed for decades, although there is still no scientific proof for that.

Humans like to think that aliens somewhat should resemble ourselves, having physical, biological bodies. But an alien intelligence could also be represented by complex systems of microscopic monitoring devices, constructed via molecular nanotechnology. They could exist on the quantum level, or as intelligent energy fields all around us; they could be there in the particles you sneeze, in the evening breeze, in the sand on the beach... Now, wasn't that poetic!





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