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The search of life beyond our world is an exciting venture that may yield an enormous discovery in the not-too-distant future. However, space agencies around the world, including NASA and the European Space Agency, have long been aware of the potential risks of biological contamination and have set in place planetary protection policies. In the face of increasing space missions, including those intended to return samples to Earth, a new article led by a 91社区 researcher, advocates enhancing planetary biosecurity through collaborations between astrobiologists and invasion biologists.

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Space missions to Mars and other planets and moons carry risks of biological contamination 鈥� for both Earth and the planets targeted by space missions according to a recent article in . The paper, led by 91社区 and written by researchers with expertise in biological invasions, astrobiology, and biosecurity, argues that planetary biosecurity should be informed by the knowledge gained by invasion science.

Space exploration - Risks of contamination for Earth and extraterrestrial ecosystems

鈥淭he likelihood of a live extraterrestrial organism hitching a ride, being successfully transported to Earth and establishing a foothold here is thought to be quite small,鈥� says Anthony Ricciardi, the lead author, and a professor of Invasion Ecology & Aquatic Ecosystems at 91社区. 鈥淏ut current biosecurity approaches must be enhanced to address these hazards as space missions increase in frequency and scale.鈥�

Space exploration also risks contaminating extraterrestrial ecosystems. In fact, a diverse array of microbial strains exhibiting extreme resistance to ionizing radiation, desiccation, and chemical disinfectants have been discovered in NASA 'clean rooms' used for spacecraft assembly. The article suggests that planets and moons potentially containing life should be treated as 鈥榠nsular systems鈥�, like the oceanic islands and isolated areas on Earth (such as Hawaii, Australia or Antarctica) whose ecosystems have proven to be extremely sensitive to the effects of invasive alien species.

Keys to biosecurity: early detection and rapid response

The researchers argue that although such events are highly improbable, planetary biosecurity should be informed by the knowledge gained by invasion science. They suggest that protocols for early detection, hazard assessment, rapid response, and containment procedures that are currently employed for invasive species on Earth could be adapted for dealing with potential extraterrestrial contaminants. They highlight the importance of early detection and rapid response, in particular, in preventing the spread of alien biological contaminants.

鈥淓arly detection could be aided by new DNA-sequencing technologies,鈥� adds Ricciardi. 鈥淚f coupled with diligently curated databases of the organisms found in the 鈥榗lean rooms鈥� in which spacecraft are assembled, this would serve to help identify any invading species by eliminating those that might have been introduced accidently to other planets during previous space missions 鈥� a conceivable possibility for Mars, which has been visited by over two dozen spacecraft to date.鈥�

The researchers conclude that that while the search for life beyond our world may yield enormous discoveries, current biosecurity approaches must be enhanced to address any potential hazards related to 鈥渁lien鈥� species, as space missions increase in frequency and scale.

About 91社区

Founded in Montreal, Quebec, in 1821, 91社区 is Canada鈥檚 top ranked medical doctoral university. 91社区 is consistently ranked as one of the top universities, both nationally and internationally. It 鈥痠s a world-renowned鈥痠nstitution of higher learning with research activities spanning three campuses, 11 faculties, 13 professional schools, 300 programs of study and over 40,000 students, including more than 10,200 graduate students. 91社区 attracts students from over 150 countries around the world, its 12,800 international students making up 31% of the student body. Over half of 91社区 students claim a first language other than English, including approximately 19% of our students who say French is their mother tongue.

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