Bacteria and fungi accumulate with ease in sealed environments.
As humanity prepares to extend its presence beyond Earth orbit, the most intimate challenges of daily life demand reinvention. Researchers at the University of Alabama and NASA have demonstrated that plasma — the fourth state of matter — can eliminate bacteria from clothing in under five minutes, without a single drop of water. On the Moon or Mars, where every resource is finite and resupply is impossible, this quiet technological breakthrough speaks to something profound: the survival of long-duration missions may depend not only on rockets and computers, but on our ability to keep clean.
- On the ISS, worn clothes are simply discarded and burned on reentry — a luxury that vanishes entirely once crews are bound for the Moon or Mars with no resupply ships in sight.
- Bacteria and fungi accumulate relentlessly in sealed environments, and some microbes in microgravity grow more resistant or begin corroding the very metal structures astronauts depend on to stay alive.
- A handheld plasma device emitting a thin violet beam destroys Staphylococcus caprae on cotton fabric in thirty seconds to five minutes, using only electricity and gas — no water, no chemicals, no damage to the material.
- Professor Gabe Xu and NASA microbiologist Chelsi Cassilly are now pushing the research further, testing plasma against a wider range of microorganisms and materials to determine whether the technology can scale into permanent lunar or Martian habitat systems.
- If validated, plasma hygiene could be integrated into space infrastructure within the next decade, transforming a seemingly mundane problem into a cornerstone of human survival far from Earth.
Aboard the International Space Station, astronauts wear the same clothes for days before discarding them to burn up on reentry. It works because supply ships come. On the Moon or Mars, they won't.
Scientists at the University of Alabama and NASA have been testing a striking alternative: a handheld device that emits a thin violet beam of plasma, eliminating bacteria from fabric in thirty seconds to five minutes without water, chemicals, or damage to the material. In laboratory tests, cotton contaminated with Staphylococcus caprae — a skin bacterium already documented on the ISS — was effectively decontaminated. The device fits in a pocket.
Plasma, the fourth state of matter, forms when gas is energized until its particles become electrically charged. Applied to fabric, it generates reactive oxygen and nitrogen species that penetrate fibers and destroy bacterial cells through oxidative stress. The method requires only electricity and a gas source — a near-perfect fit for the resource constraints of deep-space living.
The problem runs deeper than laundry. The ISS has recorded significant microbial accumulation on handrails, ventilation systems, and surfaces that appear clean. Some bacteria behave differently in microgravity, growing more resistant or accelerating corrosion in metal components. On a Mars colony, where water is scarce, energy is rationed, and nothing can be resupplied from Earth, every inefficiency is a threat.
Research leads Gabe Xu and Chelsi Cassilly plan to expand testing across more microorganisms, fabrics, and repeated-use scenarios, with the goal of scaling the technology into lunar bases and Martian habitats within the next decade. Beyond hygiene, what plasma technology preserves is something harder to quantify — the small dignities that keep human beings whole during years spent millions of miles from home.
Astronauts aboard the International Space Station wear the same clothes for days. When the fabric becomes too worn or soiled, they discard it—and watch it burn up on reentry into Earth's atmosphere. This works because supply ships arrive regularly. But when humans travel to the Moon or Mars, that luxury disappears. Water becomes precious. Space in cargo holds becomes precious. Everything must be reused, or the mission fails.
Scientists at the University of Alabama and NASA have been testing a solution that sounds like science fiction but works in a laboratory: plasma rays that kill bacteria without a single drop of water. In tests conducted in early June and reported by Olhar Digital, researchers exposed cotton fabric contaminated with Staphylococcus caprae—a bacterium common on human skin and already documented aboard the ISS—to a handheld device that emits a thin, violet beam of plasma. Within thirty seconds to five minutes, the bacterial load dropped dramatically. The cotton itself remained intact, undamaged by the treatment. The device itself is small enough to fit in a pocket.
Plasma is the fourth state of matter, created when a gas receives enough energy that its particles become electrically charged. When applied to fabric, it generates reactive species of oxygen and nitrogen that penetrate the fibers and attack bacterial cells directly, destroying them through oxidative stress. The beauty of the method is its simplicity: it requires only electricity and a gas. No water. No chemicals. No complex machinery.
The problem plasma solves is larger than laundry. On long missions in sealed environments, bacteria and fungi accumulate easily. The ISS itself has recorded high levels of microorganisms on handrails, ventilation systems, and frequently touched surfaces—places that appear clean to the eye. Some bacteria behave differently in microgravity, becoming more resistant or developing new characteristics. Certain microbes accelerate corrosion in metal components, threatening the structural integrity of spacecraft and habitats. The longer astronauts remain away from Earth, the more critical efficient biological control becomes.
For Mars colonies, the stakes are even higher. Future residents will need to maximize every resource. Water will be scarce. Energy will be rationed. Supplies cannot be resupplied from Earth. Plasma technology fits this constraint perfectly. It saves water. It reduces chemical use. It generates minimal waste. It allows clothes to be worn longer. It operates simply and portably. Every advantage compounds when you are millions of miles from home.
The research team, led by professor Gabe Xu and NASA microbiologist Chelsi Cassilly, plans to expand their experiments. They want to test plasma against other microorganisms common in human habitats. They want to see how different fabrics and materials respond to repeated treatments. They want to understand whether the technology can scale from a laboratory device to a permanent fixture in a lunar base or Martian habitat.
If the results hold, plasma rays could become as routine in space as they are invisible on Earth. Astronauts will clean their clothes without water, without waste, without the anxiety of running out of clean fabric. The technology addresses not just hygiene but comfort—the ability to maintain the small dignities that keep humans sane during months or years away from home. It is a small solution to a problem that seems small until you realize that in space, nothing is small.
Citas Notables
The technology has potential to replace traditional cleaning methods in environments where water, space, and resources are extremely limited.— Research findings from University of Alabama and NASA study
La Conversación del Hearth Otra perspectiva de la historia
Why does laundry matter so much in space? It seems like a minor detail compared to everything else that could go wrong.
Because in a sealed environment where you can't open a window or step outside, bacteria and fungi don't just accumulate on your clothes—they accumulate everywhere. Handrails, ventilation, the air itself. A single infection can compromise the entire mission. And psychologically, clean clothes matter. It's one of the few things that feels normal.
So current astronauts just... wear the same shirt for weeks?
On the ISS, yes. They wear it until it's too degraded, then it gets thrown away and burned up on reentry. That works because supply ships arrive constantly. But on Mars, there are no supply ships. You have what you brought, and that's it.
And water is the real constraint, not the ability to wash?
Exactly. Water is survival on Mars. You need it to drink, to grow food, to produce oxygen. Using it to wash clothes is a luxury you can't afford. So you need a way to disinfect fabric without water. Plasma does that.
How does plasma actually kill bacteria? Is it burning them?
Not burning—it's more like oxidative stress. The plasma creates reactive oxygen and nitrogen species that penetrate the fabric and attack the bacterial cell directly, breaking it down. The cotton survives because it's much more robust than a bacterium.
And the device is small?
Phone-sized. Portable. That matters when every kilogram of cargo costs millions to transport. You can't send a washing machine to Mars.
What happens next? Is this ready to use?
Not yet. They've proven it works in the lab against one bacterium. Now they need to test it against dozens of species, on different fabrics, with repeated use. If that works, then you start thinking about integrating it into actual habitat systems. We're probably years away from that.