Researchers at McGill University recently proposed in a policy paper that the lunar base planned by NASA should add a high-level biological isolation and research facility to conduct isolation, quarantine and scientific analysis of samples brought back from the moon and beyond deep space missions, and "pass a barrier" on the moon before entering the earth, thereby building the lunar base into the earth's first barrier against alien microorganisms.
The paper points out that mankind is entering a new era of rapid development in deep space exploration. However, the existing planetary protection and biosecurity systems have not been upgraded in step with the increasing risks of sample return missions. The core of the policy recommendations is to establish a high-security biosafety experimental facility in the lunar base to strictly isolate and test all samples from the moon and even further celestial bodies to prevent potential unknown life forms or dangerous organisms from directly entering the earth's ecosystem due to the return of samples.
The first author of the paper, Frederick I. Moxley, from a strategic threat analysis and research consulting organization in Idaho, USA, said in the article: "Humanity is entering a new era of space exploration, but our planetary protection strategies have not kept up with the risks posed by bringing extraterrestrial samples back to Earth." Moxley pointed out that the proposed lunar bioisolation facility will be equivalent to a "firewall", forming a safe isolation layer between the Earth and potentially dangerous living organisms that may be carried by future deep space missions.
Anthony Ricciardi, co-author of the paper, James McGill Chair Professor of Biology at McGill University and Dean of the Beeler School of the Environment, and Moxley further proposed in the paper that all samples from the moon or further destinations should not be returned directly to Earth, but should first be transported to a secure isolation and research facility on the lunar base, where preliminary and in-depth biosafety assessments can be completed. They suggested that within the lunar isolation facility, all incoming deep space samples should be fully operated and processed by advanced robotic systems to minimize direct personnel contact and reduce the risk of accidental sample leakage and human exposure.
Although no extraterrestrial life forms have been confirmed so far, Moxley and Riccardi emphasized that any alien life entering the Earth's biosphere may have unpredictable effects on the ecosystem. They cited the long history of invasive species on Earth as an example and pointed out that decades of research on invasive species have repeatedly proven that as long as an organism is introduced to the "wrong place and time", it may spread out of control in new ecosystems, causing potentially long-term, devastating and irreversible ecological impacts. Riccardi emphasized that these studies collectively support a "strong precautionary principle" when humans face the possibility of extraterrestrial origins of life.
The paper was published at a time when government space agencies and private space companies around the world are accelerating the pace of deep space missions beyond Earth orbit. From asteroid sampling to Mars exploration, sample return missions and manned exploration are becoming more frequent and diverse. Moxley and Riccardi believe that this busier and more competitive space exploration landscape will inevitably increase the importance of biosafety and isolation standards in deep space missions, and will also make it urgent to develop more forward-looking protection plans.
In the paper, the two authors raised concerns about multiple potential "worst-case scenarios", such as a spacecraft carrying samples crashing during return or landing, causing potentially contaminated materials to be scattered into the ground environment in an uncontrollable way; or astronauts performing missions being directly exposed to extreme extraterrestrial environments and returning to Earth with unknown microorganisms on their bodies. Moxley and Riccardi believe that with the current level of any biosafety laboratory or protective facility on Earth, it is impossible to absolutely guarantee the complete isolation, elimination or control of a completely unknown "alien microorganism" after an accident. Therefore, the source of risks should be reduced through the forward movement of space layout and mission processes.
In this context, they regard the moon as a natural "buffer zone" and space barrier: implementing a "moon first, then earth" processing path for any deep space samples will greatly reduce the possibility of potentially hazardous materials directly entering the earth's ecosystem. In other words, the biological isolation facility on the lunar base is not only a scientific research platform, but also a key node in the planetary protection system, responsible for the functions of "interception" and risk assessment in the sample return link.
Moxley and Riccardi concluded their paper by writing that the search for extraterrestrial life has the potential to become one of the most important milestones in the history of human science, but the risks must be properly managed before it becomes an emergency. In their vision, "the moon may become humanity's first biological line of defense," providing a key security boundary between future more far-reaching space exploration and Earth's ecological security.
According to reports, the paper titled "Protecting earth from extraterrestrial contamination: The case for a lunar biocontainment facility" was published in the environment and sustainable development journal "Ambio" on May 28, 2026.