The Milky Way (our galaxy) alone is home to between 100 billion and 400 billion stars, and each is potentially in orbit by several planets. There are probably at least two trillion galaxies like ours in the observable universe, each populated with billions of planets orbiting hundreds of billions of stars. Even if the planets capable of supporting life are extremely rare, on the numbers alone, there should be an intelligent life somewhere in the universe.

For example, according to Business Insider, if only 0.1% of the planets in our galaxy that could be habitable harbored life, that would mean that there would be about a million planets with a life form. These numbers have prompted physicist Enrico Fermi, Nobel Prize winner, to ask questions about extraterrestrial life forms: “Where are they?”, This question came to be known as the Fermi paradox (which essentially concerns our galaxy), and most of the possible answers would be of concern to humans.

The hypothesis of the “Great Filter”, which exposes that before intelligent life has the possibility of escaping the limits of its original planet, it strikes a kind of wall – the Great Filter, leading to the end of civilization in question. For our case, climate change, if allowed to continue, will eventually devastate much of life on Earth as we know it. It is the remarkably stable climate of the last 12,000 years that has allowed human civilization to flourish, benefiting from agriculture and finally from industrialization, although it may also paradoxically be our loss …

Recent research highlights several characteristics of the species most likely to survive the rigors of a planet ravaged by climate change: two of the most vital are to eat little and a fast reproductive cycle. Therefore, humans are basically the opposite of the types of creatures considered “survivors”. In other words, although things do not unfold in the same way on different planets, it is possible that there are so many obstacles to overcome in an evolution that can be rapid, that the civilization s ‘self-destructs.

David Wallace-Wells wrote in New York Magazine:

“In a multi-billion-year-old world with stellar systems separated by time and space, civilizations could emerge and grow just too fast for us to find. Also, the mass extinction that we are experiencing now is just beginning, so many others are dying. “


Image credit: The day after

Other thinkers have different answers to the Fermi paradox, which are even stranger. Including Anders Sandberg, neuroscientist of Oxford, Milan Ćirković, member of the Belgrade astronomical observatory, and Stuart Armstrong, expert in artificial intelligence, who suggest that the extraterrestrials did not go out, but hibernated, waiting for the universe is cooling down. Or, Professor Zaza Osmanov of the Free University of Tbilisi who believes that our search for “signs” of extraterrestrial megastructures must still be pushed because we are looking around the stars, whereas according to him, we should look around the pulsars.

And the physicist Brian Cox who suggests another possibility; a warning tale for our own civilization as well as others.

“It may be that the growth of science and engineering inevitably exceeds the development of humanity, leading to disaster,” says Cox.

If intelligent life goes out unintentionally as soon as it progresses sufficiently, the physicist believes that “we could approach this position” …

Conclusion : If we do not find so-called intelligent extraterrestrial life in our galaxy, then can this life in question disappear, in the sense of mass extinction? This is what the Fermi paradox proposes, as simply explained. However a galaxy on two trillion other galaxies, it still leaves an infinity of possibilities to find the life, finally, still it is necessary to be able to explore these possibilities, if we do not face this great filter ….

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