NASA’s Perseverance rover has found a small problem with big consequences for future explorers: very fine Mars dust can cling to materials used in spacesuits. The finding gives engineers more information about what they will need to keep out of astronauts’ living quarters.

In an Oct. 26 announcement, NASA described measurements collected over 1,645 Martian days. The agency said the findings were scheduled for publication Oct. 27 in the Proceedings of the National Academy of Sciences.

The work is an early step toward safer equipment. It does not mean NASA has finished a dust-proof Mars suit or established exactly how much dust a crew could safely breathe.

Featured image: AI-generated editorial illustration by OpenAI for The Utica Phoenix. The fabric and enlarged dust are conceptual, not NASA equipment, microscope imagery or study data; not to scale.

What the rover found

NASA reports fine particles below 2.5 micrometers and much smaller grains around 100 nanometers. For comparison, a typical human hair is about 70 micrometers across. A nanometer is one-billionth of a meter.

Different surfaces collected different sizes of dust. Some particles averaged about 2 micrometers. Others ranged down to roughly 100 to 300 nanometers. NASA calls these the first on-site measurements of fine and ultrafine particles on Mars.

The smallest grains stayed attached despite years of rover movement. NASA says static electricity appears to help determine which grains stick to which materials. That makes simply shaking off visible dirt an uncertain answer to the finer dust problem.

A rock-science tool gets another useful job

One instrument involved is PIXL, short for Planetary Instrument for X-ray Lithochemistry. It is about the size of a lunchbox and sits at the end of Perseverance’s robotic arm. Its usual job is to map the chemicals in rocks.

As NASA explained in its description of PIXL before launch, the instrument uses a narrow X-ray beam to check small spots on a surface. A positioning system makes tiny movements so it can build a chemical map from many readings.

That ability helps scientists connect a rock’s chemistry with its texture. For the dust work, the useful targets included materials already carried aboard the rover. This is an example of getting more science from equipment that has already made the long trip to another planet.

Why spacesuit samples went to Mars

Perseverance also carries an instrument called SHERLOC. To check its performance, engineers gave it a calibration target containing materials with known properties. Think of that target as a reference card: researchers know what readings to expect and can spot changes in the instrument.

NASA’s 2019 account of the calibration device described a plate about the size of a large cellphone, with 10 targets. Some were included to serve a second purpose: testing how spacesuit materials withstand the Martian environment.

That matters because an instrument check and a materials test can share the same small piece of hardware. Engineers do not have to send a full human-sized suit to start learning how selected parts of one might age.

In a 2020 explanation of the sample choices, NASA spacesuit designer Amy Ross described several different needs. Vectran helps resist cuts. Teflon has been used in parts of astronaut gloves. A polycarbonate sample represents material used in helmet bubbles and visors. Other samples test fabrics and a dust-resistant coating.

Those choices show why there is no single test for a good spacesuit. A material may resist cuts yet respond differently to dust, radiation or repeated use. Protecting a person requires several materials and moving parts to work together.

Ross also explained that suits need bearings at joints such as the shoulders, wrists, hips and ankles. Dust must be kept out without taking away the movement an astronaut needs to walk, kneel or repair equipment.

Why particle size matters

Earth’s air-pollution research offers a reason to take fine particles seriously. The Environmental Protection Agency explains that small particles can travel deep into the lungs, and some can reach the bloodstream. It defines PM2.5 as fine inhalable particles generally 2.5 micrometers or smaller.

That is useful background, but it does not turn a Mars dust measurement into a medical diagnosis. The composition of dust, the amount inhaled and the time spent exposed all matter. A particle found on a rover sample is not a measurement of the dose an astronaut would receive inside a habitat.

The practical question is how much dust could make the full journey from the ground to a suit, through an entry area and into air a crew breathes. Future tests have to examine that chain, not just whether a surface looks clean.

Some dust-control ideas have already been tested

There is real progress to build on, although it comes from a different world. In March 2025, NASA’s Electrodynamic Dust Shield operated on the Moon aboard Firefly Aerospace’s Blue Ghost Mission 1.

NASA reported that the shield removed lunar dust from glass and thermal radiator surfaces. It uses electric forces to lift and move the particles. The before-and-after results were a demonstration on the Moon, not a simulation of an entire Mars mission.

The distinction is important. Clearing those surfaces is evidence that the technology can work in that setting. It does not establish that every suit fabric, seal or habitat entry can be kept clean for months on Mars. Different hardware needs its own tests.

NASA also described work at Johnson Space Center’s Lunar Development and Test Facility in August. Engineers use vacuum chambers and simulated lunar soil to evaluate components, including mechanisms with moving parts. The facility has tested a handheld electrostatic dust-removal tool.

These ground tests let engineers expose hardware to controlled conditions and examine it afterward. They complement measurements from a robot on another planet. Neither approach, by itself, answers every question about a future crew’s daily work.

What still needs to be established

The next useful answers are practical ones. Can a material remain flexible while collecting less dust? Does a cleaning method remove the smallest particles without damaging the surface? How much dust crosses an entry area during repeated trips outside?

Those are engineering questions raised by the finding, not results already delivered by this study. A small exposed sample also cannot reproduce every bend, scrape and repair that a complete spacesuit will face.

For readers following space exploration, the value of this work is the chance to identify a problem before people have to live with it. A future Mars mission will need dependable seals, clean air and equipment that lasts. Measurements of tiny grains help make those requirements more concrete.

Reporting note: The new dust findings are attributed to NASA’s Oct. 26 announcement. The full journal paper was not independently reviewed for this report. Earlier NASA sources provide background on the instruments, materials and separate dust-control tests.