The more I study the universe and the elements that make life possible, the more skeptical I am about the existence of extraterrestrial life.
Extraterrestrial life is certainly possible since the matter is the same throughout the Universe and acts according to the same laws, but when we talk about probabilities, its calculation is extremely pessimistic.
According to the Chilean astronomer Patricio Díaz Pazos, the probability of extraterrestrial life is: 0, 000 000 000 000 000 000 000 000 000 000 000 000 1 “ as a requirement for the existence of some type of living being, in the circumstances we know.
We are the result of a huge set of small "coincidences" without which intelligent life could not occur.
Life is possible thanks to very precise physical magnitudes.
The mass of the universe in physical terms is approximately 1056 grams. What would happen if they were 1057 or 1055 instead? Except for mathematicians, almost no one cares about the answer. But when the consequences of that change are calculated, a surprising conclusion is reached: we could not exist.
When we study elementary particles we see that a proton has the same charge as the electron, but the proton is 1836 times heavier than the electron. Why? What would happen if instead of 1836 it was 1900 or 1580? We wouldn't be here.
In physics we talk about four forces, and only four: electromagnetic, gravitational, strong nuclear and weak nuclear. If I compare the gravitational force with the electromagnetic force, I find that the interaction between two electrons - which repel each other, but are attracted by gravitational force - is approximately 1040 times more intense in its repulsion effect than in the attraction. The electromagnetic force is incredibly more powerful than the gravitational force. What would happen if the electromagnetic force was 1041 or 1039 stronger than the gravitational force? We wouldn't be here.
The strong nuclear force compared to the electromagnetic force is 137 times stronger. What would happen if we changed that number to 150? We wouldn't be here.
In the observable universe there are approximately 10 000 000 000 000 000 000 000 stars. Thanks to this, nuclear fusion is efficient enough to produce elements such as hydrogen, helium, nitrogen, carbon and oxygen. So what would happen if there were significantly more or fewer stars in the universe? We would not be here.
Up to this point it does not seem that the existence of extraterrestrial life is very improbable, in the end the "coincidences" mentioned above are not only applicable to make life possible on a planet like Earth, but also to make it possible on other planets that have all other conditions necessary to house it; However, as we look at those more "exclusive" causes that are necessary for life, the reasons to believe that we are alone in the universe increase drastically.
Let see:
It is known that only spiral galaxies can contain planets in stable orbits around their stars. And only 6% of known galaxies are spirals like our Milky Way. Only here is the posibility of life in 94% of galaxies in the observable universe ruled out.
Life is not possible in the part close to the center of the Milky Way because there is an enormous amount of energy - and harmful radiation - produced by an active nucleus where there is probably a black hole with a mass equivalent to three million times that of the Sun. Nor is life possible in the farthest periphery of the Milky Way because heavy elements such as calcium, carbon, iron, phosphorus, oxygen, etc... are needed. The part of our galaxy where the Earth resides is the only one where it is possible to harbor life if the other -many- conditions that make it possible are met.
The Sun is a star a little larger than most stars. Life on Earth would not be possible if the sun were much younger or much older. Life would also not be possible if the mass of the sun was 10% larger or 10% smaller. Life would not be possible if the earth were 10% closer to the sun or 10% further away.
The reality is that the Earth is such a strange planet that it is unlike any other space body. Conditions for life to become more complex: adequate distance from the Sun so that water remains liquid; adequate mass of the planet to retain the atmosphere and oceans, just the right amount of carbon to allow the development of life, a neighbor like the planet Jupiter that saves us from the most dangerous asteroids, etc. Too many coincidences to be optimistic about the existence of extraterrestrial life.
The current optimism regarding the existence of extraterrestrial life is not something that currently comes from true science (who got off that ship decades ago), but rather from a science converted into a catwalk where fashions such as time travel and parallel universes also parade.
It is very curious that until the middle of the 20th century, no events or testimonies were recorded that spoke of beings from other worlds or extraterrestrial ships. It was only when the scientific community began to speculate about the possibility of life on other planets (which serious scientists no longer do) and the media began to enthusiastically spread it, that the UFO "sightings" began. It is also curious how later many of these UFOs have been verified as being of human origin (balloon probes, fragments of artificial satellites, spy planes, etc.)