In general, solutions to Fermi’s paradox come down to:

  • Life is difficult to start and to evolve to an intelligent and technologically advanced stage and we’re the only one in the galaxy.
  • Advanced civilizations destroy themselves on short timescales.

As the revised Drake equation solution (N<<1) shows, it seems that hopefuly, the first solution is the answer.

Here is a list of the various assumptions along with notes pointing to related problems and contradictions.

They are here unobserved

They were here and they left material evidence:

UFO’s, alien artifacts, ancient astronauts. Problem: evidence for aliens is non-existent.

Zoo scenario:

The aliens are here and they are keeping us in a well designed zoo (cut off from all contact) or there is an treaty preventing contact with young races. Problem: this scenario can’t be tested. Only one ET could break the embargo.

They are us:

Humans are the descendents of previous alien civilizations. Problem: where are the original aliens? where are all the other alien civilizations?

They exist but…

They didn’t have enough time to reach us:

The speed of light slows communications and makes space travel too long. Extraterrestrial’s messages may not have reached us yet. Problem: the galaxy exist for billions of years, even if one ET civilization formed a few million years before us, the galaxy would be already filled with Bracewell-Von Neumann probes.

They are sending signals, but we do not know how to listen:

The galaxy is filled with killer robots looking for signals. ET is keeping low. Problem: no evidence of berserkers coming after us.

They have no desire to communicate:

ET has no interest in communicating with lesser intelligences. Problem: with millions of possible civilizations, some of the extraterrestrial ones would be interested in our species.


Civilizations only have a limited lifetime, they are all dead.
Dangerous particle physics
Nanobots -> the gray goo problem

They developed different mathematics:

Mathematics is the universal language, but humans may have a unique system of mathematics that ET cannot understand. Problem: then where are those incomprehensible signals?

They do not exist because…

We are the first in the galaxy:

Life is new to the galaxy and evolution takes time. We are the first intelligent civilization. Problem: the Sun being an average star, if other stars formed a million years ahead of us, then they would be a million years ahead of us technologically speaking.

Planets with the right conditions are rare:

Habitable zones, proper orbit for liquid water are rare
The galaxy is a dangerous place (asteroid impacts, gamma-ray bursters, etc)
The Earth/Moon system is unique (large tides needed for molecular evolution)
Life is rare

Life’s genesis is rare:

Intelligence and tool-making is rare
Language is unique mankind
Technology and science is not inevitable


What do you think?

Leave us your thoughts below!



Possible Answers to the Fermi Paradox SKU UPC Model

Sep 21, 2017 by Sean

My theory is that the nearest civilizations are under a non-interference accord that prevents them from making contact with covilizations that are still developing spacefaring technology. In all likelyhood they probably just enjoy watching us put the pieces together, kind of like how we enjoy watching babies and young children solve puzzles that challenge them but are easy for us. Who knows?


Aug 15, 2017 by Laurentiu Motos

Whatever the conditions needed for life may be, whatever the technological capabilities, there is one fundamental difference that i did not see posted anywhere in regards to the Fermi Paradox. Curiosity.
Taking into account the diverse carnivorous species on earth, the ways hunting has evolved in animals, all of which we as humans had to keep our eyes on and in time our brain evolved to think in such a manner to envision potential ways that we could be attacked and killed. This is not necessary to be true on other planets. Another difference would be the basic way our brain categorizes things, fits them into categories so that they may be easily predicted and analyzed. Pattern recognition has no logical reason to be developed outside our planet and it's diverse environment. As such, even if life has evolved on other planets, it may just not be fundamentally curious, and, as such, never have evolved technological capabilities which require patterns in order for any kind of technology to work.


Mar 17, 2017 by Pete

An answer to the Fermi paradox could be that we haven`t developed the technology to receive messages from other civilizations. The idea that we will detect signals that crawl across space at the speed of light is the issue: a more advanced civilization *might* have a faster than light communication system that we have yet to dream off. Faster than light / warp type drive system seem to be a requirement for meaningful travel between stars. Of course these things are beyond our current understanding. Einstein`s rules preclude FTL- yet we can envisage possible ways around the limits - albeit requiring huge energy and technology beyond our current abilities.

3.7 5.0 13 13 "ET has no interest in communicating with lesser intelligences. Problem: with millions of possible civilizations, some of the extraterrestrial ones would be interested in our speci Possible Answers to the Fermi Paradox

Submit Your Thoughts

Submit your review
* Required Field