with the mission Artemis II operational around the Moon, humanity has Mars among its colonizing desires. Past and present missions, such as NASA’s Curiosity rover, aim to analyze its surface for clues to past habitability. And although we have found them, leave a lot of unknowns. We haven’t set foot on Mars yet and we already have in mind how we will build the houses there (spoiler: with bricks and urine). And that if one day a human being is born in a possible human colony on Mars, it will not be homo sapiens on the anthropological level.
Because in short, if we get to Mars and start being born there, we will no longer be the same species: Scott Solomon, an evolutionary biologist at Rice University, has been studying this question for years and has reached that conclusion, which he recently published in his work “Becoming Martian“.
If you are born on Mars, you are not homo sapiens. Solomon differentiates between those who arrive from Earth to Mars and survive there, those colonists who arrive at the red planet with a body molded by millions of years of evolution here. But their creatures and their creatures will not have the same luck. In short, it will be the beginning of the end for homo sapiens.
Mars has 38% of Earth’s gravity, radiation two or three times higherthere is no protective magnetic field nor the microbial biosphere with which our immune system It was evolving. All of the above constitutes an engine of biological change and evolution that has marked our anatomy and its absence, too.
Why is it important. Evolutionary biology has a name for what will happen: allopatric speciation. That is, when a population is isolated and develops in a new environment, natural selection and genetic drift continue their course within the adaptation to the environment with respect to the original population (in this case, those who remain on Earth).
The passage of time can cause the two groups to become so different that they are another species, a new human species. And something paradoxical would happen: by looking for planets other than Earth as an alternative to continue preserving the species, we would stop being the same.
Context. You don’t have to go to future generations to see the consequences of space life. There is evidence of astronauts on the ISS who have suffered accelerated loss of bone mass, muscle atrophy, cardiovascular problems, vision problems and stress. Until your blood is mutating. The creatures born there will develop their skeleton and nervous system directly under these conditions.
Salomon offers concrete changes: denser and shorter bones, greater eumelanin production (a type of melamine responsible for the dark coloration) as protection against radiation, an immune system calibrated for the closed environment of the colony and potentially vulnerable to diseases common on Earth. However, the most sensitive point is reproduction: we do not know for sure whether humans will be able to conceive, gestate and give birth successfully on Mars. Experiments with mammals in microgravity are worrying. The biologist also anticipates that childbirth on Mars would inevitably be surgical: the lower bone density and muscle atrophy make it an even more risky activity.
What will happen next. For Solomon there are two possibilities: Let natural selection take its course and shape future generations. The second is to resort to genetic engineering: get ahead of the problem before sending them there. In any case, the macro result is the same: two branches of humanity evolving on separate paths, in different conditions and in different worlds.
A dystopian future of genetics and ethics. It should be noted that thousands of generations are needed for speciation to occur, which gives sufficient time for humanity to take measures, such as frequent travel or assisted reproduction with transferred genetic material. Or that genetic engineering steps on the accelerator so much that natural selection takes a backseat.
Ethics also comes in here: if a boy or girl is born on Mars and cannot return to Earth because their body cannot resist it, humanity will have made an irreversible decision without their consent. Solomon warns also of that gap in humanity in terms of identity and rights. These are questions that we cannot answer now, but that should be clear before the existence of a colony on Mars is seriously considered.
Cover | Photo of Dmitry Grachyov in Unsplash
GIPHY App Key not set. Please check settings