Comet 3I/ATLASthe third interstellar object ever spotted in the Solar System, continues to be talked about. Observations from the gigantic ALMA array, in the Atacama Desert, revealed that the alien comet is free in space methanol And hydrogen cyanide: two molecules common in “our home” comets, but present here in a surprisingly unbalanced relationship.
According to the data analyzed by the NASA team led by Nathan X. Roth, methanol is decidedly prevalent and increases as the comet approaches the Sun, while hydrogen cyanide comes more directly from the icy nucleus. This is unusual behavior, rare even in the most complete cometary databases.
Avi Loeb, a Harvard physicist known for his always direct and unconventional approach, chose clear words to explain the phenomenon: 3I/ATLAS is not a “murderer who spreads poison”but rather a body that transports compounds useful for the chemistry of life. In fact, Loeb reminds us that methanol and cyanide — beyond their somewhat disturbing names — are molecules present everywhere in biological processeseven in the plants that we see before our eyes every day.
Because methanol and hydrogen cyanide are not (just) poisons in space
Methanol, despite being toxic to humans, is a fundamental molecule in the construction of organic compounds: from the reactions that lead to amino acids until the formation of the simplest sugars. Hydrocyanic acid, in the imagination linked to world conflicts and lethal gases, takes on a completely different role in space: it can contribute to the creation of the nitrogenous bases of DNA and RNA, in particular adenine.
It is precisely by observing molecules like these in comets that the idea of panspermiaan ancient theory according to which the ingredients of life travel between the stars transported by comets and asteroids. Loeb, who supports this possibility with enthusiasm, manages to summarize it in a simple image: 3I/ATLAS as a “friendly gardener” dispersing chemical seeds, not as a bringer of death.
ALMA data confirm this: the methanol/HCN ratio is among the highest ever measured, second only to the anomalous comet C/2016 R2. A true cosmic rarity, which makes 3I/ATLAS a perfect natural laboratory to understand how, in very cold environments far from any star, complex organic chemistry can take shape.
The images and analyzes show a coherent picture: the most methanol-rich jets point towards the Sun; hydrogen cyanide diffuses more peacefully from the nucleus; and the comet, active and unpredictable, seems to bring with it an authentic fragment of its origin system. Not just a “star tourist,” then, but a messenger of what organic matter might look like outside of our cosmic neighborhood.
A look that changes the story
For science, every interstellar object is an open window onto places we won’t be able to visit for a long time. After ʻOumuamua and Borisov, comes a third fragment of another stellar story: a rich, dynamic comet, with chemistry as familiar as it is mysterious.
It is easy to imagine the fascination of this discovery: an object born around another star, arriving from unimaginable distances, crossing our Solar System leaving behind substances that may have been the basis of life. And while there are those who focus on HCN as a “poison,” researchers look at the full picture, remembering that nature does not think in moral categories, but in chemical reactions.
Loeb, in his somewhat surprising but effective way, closes like this:
3I/ATLAS is not poisoning us. It’s doing exactly what comets do: scattering seeds.
And perhaps this is precisely what makes each passage so fascinating: a promise of knowledge that is worth pursuing, without prejudice and with the curious gaze of those who know that the Universe is much more creative than us.
