When humanity contemplates sending assets to other planets, what should be our goal? There are two fundamental choices:

1) Use artificial intelligence (AI) astronauts to plant seeds of scientific innovation in other locations, so that intelligence is duplicated and not at risk of extinction.

2)Make numerous copies of what nature already produced on Earth.

The choice is between taking pride in what nature manufactured over 4.5 billion years on Earth through unsupervised evolution and natural selection, or aspiring to a more intelligent form of supervised evolution elsewhere.

The first choice AI is apt to an industrial duplication line, for which the proof of concept for the assembly line was already demonstrated on Earth and we can duplicate it in an Earth-like environment. We are emotionally attracted to the second choice, because we are attached to ourselves and our natural path for maintaining the longevity of our genetic-making through biological reproduction.

Prioritizing the natural processes of the second choice is misguided for two reasons. First, we tend to think we are special and so reproducing more of us is appealing. Second, we forget the extensively long series of trial and error that ended up in our naturally selected species. The second choice reflects a unique selection bias, namely we like who we are and imagine that if we duplicate natural selection in an Earth-like environment somewhere else something as special as us will result. Of course, natural selection holds no such guarantee. This underscores the appeal of the first choice of AI, which promotes new systems that are more advanced and adaptable to very different environments. If evolution is supervised by AI systems with 3D printers, it could be more efficient at identifying optimal solutions to new challenges that were never encountered before.

The second approach was the sort adopted by barbarian cultures throughout human history. Its brute-force simplicity in making copies of existing systems could lead to dominance by numbers, but its main weakness is that it is vulnerable to new circumstances that previous systems cannot survive. For example, the dinosaurs were not smart enough to use telescopes capable of alerting them to the dangers of giant space rocks. Also, the ideas offered by Ancient Greek philosophy survived longer than the Roman Empire despite the latters military might in conquering new territories.

AI scientists could use machine learning to navigate through virgin territories and adapt more effectively to their challenging terrain than terrestrial life forms. In this vein, AI systems could be viewed as our technological kids and a phase in our own Darwinian evolution, as they represent a form of adaption to new worlds beyond Earth. There is no reason for us to be attached to primitive representations of life on Earth, just as there is no reason to resurrect the dinosaurs.

Periods of snowball Earth removed some forms of life from our terrestrial habitat, but the physical challenges on other planets could be so extreme that envisioning terrestrial life there is a non-starter. Adopting survival tactics by AI systems in these alien environments might be essential for tailoring sustainable torches that carry our flame of consciousness there.

Is there a smarter kid on our cosmic block who already figured out the best strategy? If so, it would be interesting to find out whether the first choice or the second are more popular among extraterrestrial civilizations.

The first choice has a higher likelihood of survival in the face of natural disasters, such as loss of planetary atmospheres, climate change, meteorite impacts, evolution of the host star, nearby supernova explosions or flares from supermassive black holes. However, the second choice natures choice could be sufficiently infectious, like the omicron variant of COVID-19, so as to seed many locations at once and compensate for its reduced impact.

By studying other planets for signs of life we could identify which choice is most favorable and even might learn what was most popular by civilizations elsewhere. Based on human history, we might find evidence for a lot of barbarian cultures that had perished and a much smaller population of intelligent cultures that maintained longevity. Although more difficult to find, those precious needles in the haystack that survived over billions of years, could teach us an important lesson about the favorable path. To put my cards on the table even before we find them: I am all in favor of option A for AI than B for barbarian.

Avi Loebis head of HarvardsGalileo Project,a systematic scientific search for evidence of extraterrestrial technological artifacts. Loeb is the founding director of Harvard'sBlack Hole Initiative, the director of the Institute for Theory and Computation at the Harvard-SmithsonianCenter for Astrophysics, and he chairs the advisory board for the Breakthrough Starshot project.He is the author ofExtraterrestrial: The First Sign of Intelligent Life Beyond Earth.

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