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Do aliens exist? or in the universe

saikumartekumatla3 September 2, 2022 129 Comments

Several scientific advances support the existence of other possible scenarios for life in the universe.

As an astrobiologist, I would love to answer your question with a resounding yes, but the truth is that, today, we still do not have any irrefutable evidence of the existence of extraterrestrial beings. However, there are several scientific advances that strongly support the existence of other possible scenarios for life in the universe.

The first of these advances began in 1953, when the chemist Stanley Miller, from a mixture of gases to which he applied energy, synthesized several of the simplest molecules that make up living matter. This experiment marked the beginning of prebiotic chemistry, a branch of chemistry that is having great success in trying to understand how the basic ingredients of life could be synthesized under conditions on the early Earth. Today we know that many of these molecules are also present in meteorites, comets or interstellar dust clouds, suggesting that they should not even have been synthesized on our planet, but could have come from outer space. And, if that has happened here, why couldn’t it also happen elsewhere in the universe?

The discovery of these microorganisms shows us that life is very robust and could thrive on planets with conditions very different from those we consider optimal

Our hopes that life could exist outside the Earth have also increased considerably thanks to the discovery of extremophile microorganisms , capable of living in apparently very adverse environmental circumstances: temperatures of more than 100 degrees Celsius, very acidic pH, high salt concentration… The discovery of these microorganisms shows us that life is very robust and could thrive on planets with conditions very different from those we consider optimal.

Finally, thanks to technological development, we have been able to observe beyond the Solar System, which has allowed it to discover several thousand extrasolar planets . Having explored only a small part of the cosmos, it can be expected that there are hundreds of trillions of planets in it. With these figures, who dares to ensure that there is no life in any of them?

Therefore, and returning to the initial question, as science advances, the reasons to believe that life could be abundant in the universe increase. However, it is no less true that it might not be easy to find it. On the one hand, the fact that we only know of one manifestation of life, terrestrial life, means that we are very biased regarding the properties that we expect to find in possible beings from other worlds.

On the other hand, our possibilities of traveling in space are still very limited, which means that currently the search for life outside the Earth is limited to our Solar System. And what we know about it so far tells us that it does not contain higher life, although there are some places that could allow the existence of microorganisms. Bad news for those who dream of finding civilizations similar to the one on Earth.

And not so bad for those of us who study life, since we know that any microorganism can contain infinite surprises inside. How would extraterrestrial microorganisms store genetic information? In a molecule similar to our DNA? Or would they use systems more akin to the way information is stored on a computer? Would they be able to use energies not used by terrestrial life, such as the wind or the tides, for their metabolism? What molecules would catalyze their chemical reactions? These are all fascinating questions to which we would love to have an answer.

since we know that any microorganism can contain infinite surprises inside. How would extraterrestrial microorganisms store genetic information? In a molecule similar to our DNA? Or would they use systems more akin to the way information is stored on a computer? Would they be able to use energies not used by terrestrial life, such as the wind or the tides, for their metabolism? What molecules would catalyze their chemical reactions? These are all fascinating questions to which we would love to have an answer. since we know that any microorganism can contain infinite surprises inside.

How would extraterrestrial microorganisms store genetic information? In a molecule similar to our DNA? Or would they use systems more akin to the way information is stored on a computer? Would they be able to use energies not used by terrestrial life, such as the wind or the tides, for their metabolism? What molecules would catalyze their chemical reactions? These are all fascinating questions to which we would love to have an answer.

How would extraterrestrial microorganisms store genetic information? In a molecule similar to our DNA? Or would they use systems more akin to the way information is stored on a computer? Would they be able to use energies not used by terrestrial life, such as the wind or the tides, for their metabolism? What molecules would catalyze their chemical reactions? These are all fascinating questions to which we would love to have an answer.

How would extraterrestrial microorganisms store genetic information? In a molecule similar to our DNA? Or would they use systems more akin to the way information is stored on a computer? Would they be able to use energies not used by terrestrial life, such as the wind or the tides, for their metabolism? What molecules would catalyze their chemical reactions? These are all fascinating questions to which we would love to have an answer.

The planet Mars ; Europa , which is a satellite of Jupiter and Enceladus and Titan, moons of Saturn, are the places in our Solar System where we are most hopeful of finding extraterrestrial life. On Mars, low temperatures and low atmospheric pressure prevent the existence of liquid water on its surface. It also does not have a magnetic field, which leaves it without protection against cosmic rays that are so harmful to life. But its subsoil is a much more comfortable place: cosmic rays do not penetrate and the water has an easier time remaining in a liquid state. And energy would not be a problem, once we see that on Earth there are organisms capable of feeding on the reactions that occur in the minerals of the rocks. Microscopic life in the subsoil could also be the one that predominates in Europe,

By way of conclusion, my answer is that there is a high probability that “other lives” may exist in the universe. What we should begin to ask ourselves as human beings is whether we are prepared to accept that these lives could be very different from ours and, above all, how we would establish our relationship with them.

129 Replies to “Do aliens exist? or in the universe”

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