Um...um...um... An Important Concern? The safety of chemicals on, um, Mars?

[NNadir]

Last edited Sat Jun 13, 2026, 03:09 PM - Edit history (1)

Frankly, I wouldn't have published this one about whether Elon Musk and Jeff Bezos or (insert distractable billionaire here) will be safe on Mars from chemical contamination: Toward “Safe” Chemicals and Materials on Mars: Knowledge Gaps for Expanding Planetary Protection Requirements John D. Hader, Alberto G. Fairén, Marlene Ågerstrand, Matthew MacLeod, and Bernd Nowack Environmental Science & Technology 2026 60 (13), 9744-9760.

There aren't enough resources on Earth to really send more than a few people - for no good purpose - to live on Mars.

This said, in a remotely cogent way, the concern is a paradigm for concern for the health of the few, in this case the extreme few, over the concerns of the bulk of humanity. In a way, we already live in this world, since rich nations are quite willing to send their toxic waste to poor nations. We care for ourselves at the expense of everyone else. In this case we can decide to screw the Earth, something we do with abandon, so long as Mars is "safe."

The paper is open to the public to read. If interested, one can read it at the link. I have nothing more to say on the topic other than, "sigh..."

[PJMcK]

1. Humans will not be going to Mars

Not anytime soon, if ever.

[NNadir]

2. Yeah I know. It's kind of like fusion energy in that sense, always off in some distant future with no appreciation...

...of the details.

My whole damned life - and I'm not young - the idea that humans should go to Mars has been invested with mystic portent.

As the Earth dies - and arguably it is entering its death throes - the dream of escaping to Mars to screw that planet up - will die with it.

[muriel_volestrangler]

3. It's not about danger to explorers, it's about "hazards to possible extant life on Mars" from chemicals

taken there by anything (human or robotic), rather than from Earth microbes.

The United Nations Outer Space Treaty states that the exploration of celestial bodies must avoid “harmful contamination” which may impede scientific exploration by other parties to the treaty. To guide treaty compliance, Planetary Protection regulations promulgated by the Committee on Space Research set limits for microbial contamination of celestial bodies, particularly those that may harbor extant life (e.g., Mars). However, anthropogenically introduced chemicals and materials are not regulated but may cause “harmful contamination” and thus pose a potential threat to scientific exploration. On Earth, threats from anthropogenic chemicals and materials are often managed by considering both potential exposure to the substances and their hazardous properties. The lack of knowledge around hazards to possible extant life on Mars means that chemicals and materials should be designed and used so that their exposure concentrations are minimized. Here, we review possible emission, partitioning, persistence, and transport processes on Mars for anthropogenically introduced chemicals and materials and identify key knowledge gaps. We highlight difficulties and lessons learned from pollution policy development on Earth that could inform interplanetary chemical and material management. This work aims to support the expansion of the Planetary Protection guidelines to include a “No- or Low-Exposure by Design” approach to chemicals and materials on Mars.

[NNadir]

4. That is a very esoteric concern if true. It's as if someone reported that a sunken barge endangered life on Earth.

I don't claim to have read the full paper however; it struck me as absurd just based on the abstract. I'm way behind on my reading and I just don't have time for it.

There is, at this point, no real compelling evidence of life on Mars, certainly not enough to justify vast concern for its viability because of a few small devices.

[muriel_volestrangler]

5. It also talks about the ability to investigate abiotic processes if they've been contaminated

Given the impacts of pollution on Earth, anthropogenically introduced chemicals and materials associated with robotic or crewed exploration missions could also cause “harmful contamination” to a celestial body, either to undiscovered life (if it exists) or to poorly understood abiotic processes.
...
There is also increasing concern within the Planetary Protection community regarding organic chemical contamination which could lead to false positive biological signature identification or otherwise interfere with studies of the chemical evolution of the solar system. Some modeling studies have been conducted to explore the very near-field contamination potential of organics that could be emitted from Martian rover missions in the context of false positive signatures. Interestingly, the need for large-scale chemical transport modeling has been highlighted for the Moon. There are concerns that volatile chemicals introduced by human lunar exploration missions could be transported via volatilization-deposition cycles to regions of high scientific interest, such as permanently shadowed regions. This could disrupt investigations into the chemical evolution of the solar system.

I think the idea is "don't let sloppy current science screw up future science".