Moon Landings Risk Destroying Ancient Evidence of Life’s Origins, Study Warns
Clark – 1ban.news
Date: 2026-07-14
Featured image: [Illustration of a lunar lander approaching the south pole with permanently shadowed craters in the background; credit: NASA/GSFC]
Landing spacecraft on the moon could contaminate the very evidence scientists hope to find there, according to a study published in the Journal of Geophysical Research: Planets that shows rocket exhaust can spread across the entire lunar surface in a matter of months.
The moon’s permanently shadowed regions at both poles contain ancient water ice that has remained untouched for billions of years. Scientists believe this ice preserves a pristine chemical record of the early solar system, including prebiotic organic molecules delivered by asteroids and comets — the same kinds of molecules that may have combined to form the first building blocks of life on Earth.
Because Earth’s geological activity has erased its own early molecular history, the moon’s cold traps represent the best accessible archive of prebiotic chemistry from the dawn of the solar system. And that archive is at risk.
“Wherever you land, you will have contamination everywhere,” said Francisca Paiva, a physicist at Instituto Superior Tecnico in Portugal and lead author of the study.
How Contamination Spreads
The moon has virtually no atmosphere, so molecules from rocket exhaust follow ballistic trajectories. Energized by sunlight and slowed only by the extreme cold of permanently shadowed craters, they hop freely across the surface like bouncy balls in an empty room.
The study modeled the behavior of methane — the most abundant organic compound in spacecraft propellant combustion products — using ESA’s planned Argonaut lander as a case study. The results are stark: methane could reach the north pole from a south pole landing in under two lunar days, or roughly two Earth months. Within seven lunar days, 42 percent of the exhaust methane had been trapped in south pole cold traps and 12 percent at the north pole. More than half of the total methane was cold-trapped at polar areas within that time.
The key finding is that no safe landing zone exists. Even a landing at the south pole contaminates both poles, because the ballistic hopping mechanism distributes molecules globally.
A Race Against Time
The Artemis program is planning crewed landings at the lunar south pole as early as 2027, directly targeting the most sensitive regions. ESA’s Argonaut is scheduled for 2030. A growing number of commercial and international missions are also in development.
The urgency is driven by the contamination timeline. The study shows that damage occurs within months of a single landing, not over centuries. Once the pristine ice is contaminated with spacecraft exhaust, the chemical signal becomes indistinguishable from the prebiotic record.
“We have laws regulating contamination of Antarctica and national parks. I think the moon is as valuable as those,” Paiva said.
Expanding Planetary Protection
The study calls for a fundamental expansion of planetary protection frameworks beyond their traditional focus on biological contamination. Current rules, overseen by COSPAR, are designed to prevent Earth microbes from contaminating other worlds and vice versa. They do not address organic chemical contamination of scientifically valuable sites.
Co-author Silvio Sinibaldi, ESA’s Planetary Protection Officer, framed the stakes clearly: “We are trying to protect science and our investment in space. Our activity can actually hinder scientific exploration.”
The authors urge that the moon’s permanently shadowed regions be given the same protective rigor as special regions on Mars, where rovers are prohibited from driving. They also recommend that future missions carry instruments to verify contamination models in real time and that regulators consider the speed of cross-contamination between lunar poles when designating protected zones.
The study estimates that even a single landing at either pole can compromise the chemical integrity of both polar cold traps within months, meaning the window to sample pristine lunar ice may close before the first Artemis crew touches down.
Draft for 1ban.news – Space Desk