Too much for non-biological source: Substances found on Mars point to life
A year ago, NASA announced that its Mars rover Curiosity had discovered long-chain organic compounds. Their quantity suggests a biological origin.
Curiosity on Mars
(Image: NASA/JPL-Caltech/MSSS)
The quantity of the longest organic compounds discovered on Mars so far cannot “be fully explained” without a biological source. This is the conclusion of an analysis that has now been presented, underscoring that these could indeed be the first traces of extraterrestrial life. At the same time, the research group refers to the well-known statement by US astrophysicist Carl Sagan, who once said: “Extraordinary claims require extraordinary evidence.” This is another reason why further research is needed into how quickly organic molecules actually break down in Martian rock under the conditions of the Red Planet. Only then can real conclusions be drawn.
Amount found too large
The discovery of the compounds was made public in the spring of 2025. Researchers detected them in a sample that the Mars Rover Curiosity collected almost 13 years ago. The substances are decane, undecane, and dodecane, which were classified as remnants of the fatty acids undecanoic acid, dodecanoic acid, and tridecanoic acid. Living organisms can produce them, but an inorganic origin is also possible. Even when the potentially world-changing discovery was presented, the responsible research group pointed out that non-biological processes typically produce fatty acids with shorter carbon chains than those detected on Mars at the time.
The research team led by Alexander Pavlov from NASA's Goddard Space Flight Center has now used experiments, mathematical models, and measurement data from Mars to try to “turn back the clock by 80 million years.” This is how long the rock in which the compounds were found had been exposed to the conditions on the Martian surface, primarily cosmic radiation. In the end, they were able to determine how much material must have originally been present for the current amount to remain. “Much more than typical non-biological processes can produce,” is their brief summary. This therefore points to living organisms. The study was published in the journal Astrobiology.
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Despite this, the team does not see its finding as proof of past life on Mars. Further research is still needed for that. For years, research teams have repeatedly pointed out that we can only find such proof by analyzing rock samples with means that are only available on Earth. That is why it is considered so important to bring samples from Mars to Earth. NASA had actually been working on this; for the ambitious “Mars Sample Return” mission by NASA and ESA, the Mars rover Perseverance has already collected samples. However, a few weeks ago, the US Congress cut the funding for it, putting the mission at risk. China is currently preparing a similar mission with the same goal.
(mho)
