Picture it: A swarm of tiny robot helicopters descends through a reddish-brown sky, landing gracefully on the Martian surface. What are they wearing? Tiny capes.

NASA's SkyFall mission will send a trio of mini rotorcraft to Mars equipped with ground penetrating radar technology which happens to look like little capes. These uniquely designed swaths of fabric look decidedly strange or even accidental in new videos from NASA's Jet Propulsion Laboratory (JPL) that show the little drones practice landing. But these capes are actually flexible antennae that will allow the craft to peer beneath the Red Planet's surface in search of water ice.

"The only way to detect shallow subsurface ice remotely is to fly close to the ground," Adrian Tang, SkyFall’s ground-penetrating radar lead instrument scientist at JPL, said in a statement on Thursday (Aug. 6). "By flying low and slow, a SkyFall helicopter could capture radar images that resolve the fine layering where dry soil gives way to ice, detecting its presence and mapping its extent."

Orbiting spacecraft have studied Mars for decades, imaging the planet and mapping it with radar. But from orbit, their radar is unable to see the first few feet of material just below the planet's surface — a zone where scientists expect to find shallow ice deposits mixed in with the rocks and dust. This work could be important for future astronauts who need to better understand the ground below their feet for safety reasons, and for future travelers searching for accessible ice to process for drinking water, oxygen and fuel.

Skyfall will follow in the footsteps of Ingenuity, the first rotorcraft on another world, which hitched a ride to Mars aboard NASA's Perseverance rover. The new choppers are based heavily on Ingenuity, which weighed just 4 pounds (1.8 kilograms) here on Earth. But Skyfall will be more capable than Ingenuity, whose main job was to show that choppers can explore the thin skies of Mars.

SkyFall's tiny cape ground-penetrating radar, which uses a type of flexible antenna called Vivaldi that was invented back in 1978, is designed to survey up to 16 feet (5 meters) below the Martian surface. The radar will be able to reach anywhere from several yards below the planet's surface to the uppermost layers of surface material.

And the antenna's unique design ensures that the SkyFall drones will be able to make these subsurface observations without damaging the equipment during landing.. The antenna is extremely lightweight, and the team miniaturized it to be both the right size and shape to fit the tiny helicopters, which sit just 6 inches (15 centimeters) above the ground at rest. The tricky thing was, the designers had to miniaturize the radar antennae while maintaining functionality. But they did just that, and these tiny radar capes will be able to bend and move out of the way as the rotorcraft do their thing, flying above and landing on the Red Planet.

"Although we managed to shrink the antenna quite a bit, it is about 1.5 times longer than the helicopter’s legs," Christine Gebara, SkyFall ground-penetrating radar mechanical lead at JPL, added in the statement.

"That means during landing, the Vivaldi has to bend out of the way — and if it lands on a rock, it bends even further," she added. "But when the helicopter takes off again, the antenna must spring back into place for data collection. Because SkyFall is expected to make dozens of flights exploring Mars, we needed an antenna that could repeatedly handle those pressures without losing its shape in flight."

To make these little capes capable of withstanding incredible feats on another world, the engineers behind the helicopters covered the antenna in layers of polyester and Vectran, a flexible (but incredibly strong) material that was previously used for the airbag that cushioned NASA's Spirit and Opportunity Mars rovers during their touchdowns in 2004. The antenna's shape is also reinforced with flexible fiberglass tape springs and a lightweight structure. In total, each antenna weighs a miniscule 5 ounces (142 grams).

But a crafty design isn't enough. Getting to Mars is no small feat, and NASA needs to be sure that these little helicopters and their gear are up to the challenge. So, in JPL's Environmental Test Laboratory, which recreates different elements of environments beyond Earth, the SkyFall team put the rotorcraft and its little radar antenna to the test. They bent and flexed the antenna over and over, recreating multiple landings on the surface, exposed the craft to extreme temperatures, and continually checked to make sure that, throughout this testing, the helicopter could still transmit and receive radar signals. At the end of this testing, the antenna had endured 200 simulated Mars landings and was still working just fine. That is more than twice the number of landings expected from the mission.

"This test checked every box it was supposed to and answered our biggest technical questions," Tang added. "While we still have work ahead of us before the antenna is fully flight-qualified, this was a major milestone, and the hardware performed exactly as expected."

The trio of SkyFall helicopters will put their radar capes to the ultimate test when they fly to Mars. NASA plans to launch this mission to the Red Planet in 2028 aboard NASA's Space Reactor-1 Freedom, the first nuclear fission-powered interplanetary spacecraft.

NASA's Curiosity Mars rover spotted surprising shapes in the Red Planet soil while exploring a large valley.

What is it?

These images were captured on June 19 and 20, 2026, or the 4,930th and 4,931st Martian days of Curiosity's mission. They show honeycomb-like patterns referred to as "polygonal fractures" found in a valley on Mars known as Valle Grande. They measure about 1.5 to 3 inches (4 to 8 centimeters) across.

While Curiosity has seen other curious geometric patterns on Mars before, scientists were surprised by this most recent find.

"We've seen a lot of fascinating landscapes through Curiosity's eyes, but this sea of polygons took our breath away," project scientist Ashwin Vasavada of NASA's Jet Propulsion Laboratory said in a statement. "We measured their shapes and chemistry carefully and are hopeful there are clues in the data as to how these features formed."

Why is it incredible?

This field of polygons in Valle Grande extends as far as Curiosity's instruments could see, even around the base of a steep hill scientists named "Miraflores."

While mission scientists have theories about how these structures form, it ultimately remains a mystery how they formed.

It's thought that changes in temperatures on Mars could have caused water to squeeze through sediment layers, but scientists will need to collect more data before they can reach a conclusive answer.

Planting boots on Mars is hard enough. But getting "breathing room" on the Red Planet without inhaling toxic dust is yet another issue.

Given NASA's plans to eventually put astronauts on the Red Planet, the agency assembled a Martian Dust Limit Working Group earlier this year to review what's known and unknown about the toxicological hazard to human crews from exposure to Mars dust. The ultimate goal was to establish a permissible exposure limit for humans on the Red Planet by compiling a comprehensive set of expert perspectives regarding Martian dust toxicology, exposure pathways and mitigation strategies.

The working group's conclusions reinforced the view that an initial Martian dust standard "must balance conservatism with operational feasibility while accommodating architectural and scientific uncertainty," the report states. Furthermore, the report explains, "as additional Martian data and toxicological research become available, this standard should be periodically revisited to ensure continued protection of crew health during human exploration of Mars."

Unique study

A panel member for that study was Brian Hynek professor in the Department of Earth Science and a research associate at the Laboratory for Atmospheric and Space Physics, both at the University of Colorado, Boulder.

"It was a unique study," Hynek told Space.com, conducted by NASA specialists, space medicine experts, habitat designers, including toxicologists, volcanologists and geologists. "The task was to help gauge health hazards to humans, both for short and long-term stays," he said.

Just highlighting the differences between the moon and Mars played a role, said Hynek. "The moon is worse in some ways and Mars is worse in other ways."

Disneyland of dust

To be sure, one outcome from Apollo moonwalkers – the "dusty dozen" – is that dealing with lunar dust proved to be troublesome, much more than expected. The aged moon is a Disneyland of dust and crews that went there attested to that fact.

Once out and about, moonwalkers coped with very fine, tiny particles composed of sharp, glassy material. Lunar dust stuck to everything it came in contact with; dust eroded their spacesuits, caused overheating on equipment and instrumentation, compromised seals on their spacesuits, even irritated the eyes and lungs of moonwalkers.

"On Mars, dust particles are a little more rounded, not as jagged and cutting into you. But then you have all the extra chemical components and minerals that you don't have on the moon, like really unhealthy perchlorates," Hynek said. "We can use the lunar knowledge, but Mars is a totally different place," he added.

Heavy metals

Hynek noted that Martian dust is known to contain various carcinogens, such as silica and numerous heavy metals. He co-authored a recent paper on "Potential Health Impacts, Treatments, and Countermeasures of Martian Dust on Future Human Space Exploration."

"There's talk about growing crops on Mars," Hynek observed. "The martian soil is full of all these nasty chemicals. So the astronauts might get more exposure from what they are growing on Mars than the actual airborne dust," said Hynek.

Then there's the dust that will assuredly find its way into the habitat, Hynek said, so engineers are looking at filtering systems and just how much time will be required to clean the inside of the habitat.

"It's good to have the forethought and to start considering the Martian dust and its hazards. It poses a lot more health hazards than the lunar dust," Hynek concluded.

Learned our lesson

Joel Levine, a research professor in applied science at William and Mary in Williamsburg, Virginia, is a leading expert on lunar dust, engineering and safety concerns. He was not a panel member of the NASA report.

Levine cited earlier thinking from a recent National Academy of Sciences report on human exploration of Mars. Two goals noted in that 2026 report are Mars dust-related:

• Determine what controls the onset and evolution of major dust storms, which dominate present-day atmospheric variability.
• Characterize the effects of Martian dust on human physiology and hardware lifetime.

"This indicates that Mars dust is on the minds of mission planners! This is good news based on our experience with lunar dust on the Apollo landings," said Levine. "It looks like we learned our lesson about dust at future human landing sites."

Levine stated that Mars sample returns would be very helpful to characterize Martian dust samples for chemical composition and other qualities. "Unfortunately, it does not look like the Mars samples already collected will ever be returned to the Earth for analysis," he said.

Major takeaways

Shaunna Morrison, an associate professor in the Department of Earth and Planetary Sciences at Rutgers University in New Jersey, served as a panel member on the Martian Dust Limit Working Group.

"One of the major takeaways from the Mars dust working group is that martian dust is a real crew-health and engineering issue, but it is also a tractable one if it is treated as a design requirement from the beginning," Morrison emphasized.

The worry is not that Mars dust is uniquely or catastrophically toxic based on what we know now, Morrison told Space.com.

"The concern is that future crews will be living and working in a closed habitat, repeatedly going outside, bringing dust back in on suits and equipment, in a low-humidity environment," said Morrison. That's a condition in which small particles are more prone to becoming airborne and potentially inhaled, she said, and potentially crew members being exposed to fine respirable particles over many days.

Prevention first

Morrison said that a key point is that we do not have as yet returned samples of authentic airborne martian dust. So NASA has to build a conservative standard using the best available evidence: lunar dust toxicology, Mars simulant studies, and the very extensive chemical and mineralogical datasets from Mars rovers and landers, she pointed out.

"The best strategy is prevention first," Morrison said. "Keep as much dust as possible outside the habitat, remove it quickly when it gets in, monitor airborne particles, and design the system so crews are not relying on medical countermeasures after exposure," she advised.

Hey, Space Fans! Every weekend here at Space.com, you may have noticed we highlight the latest episode of the podcast This Week In Space, a TWiT show co-hosted by yours truly and my friend and colleague Rod Pyle, a space historian and editor of the National Space Society magazine Ad Astra.

This Week In Space episodes usually drop each Saturday, but this week we're doing something a bit different. To mark the 50th anniversary of NASA's Viking landings (Viking 1 touched down on Mars on July 20, 1976), Rod and I will host a special live taping of the podcast to discuss all things Martian starting at 1:30 p.m. EDT (1730 GMT). It should last up to 90 minutes.

Joining us on the podcast will be:

• Dr. Pascal Lee, a planetary scientist, geologist and artist with the SETI Institute, Mars Institute and NASA Ames Research Center.
• Dr. Penny Boston, an astrobiologist and speleologist (the study of caves) with the New Mexico Institute of Mining and Technology.

During our discussion, we'll touch on the personal and scientific impacts of NASA's Viking Mars landings and look at where Mars exploration may go in the modern age. We might even discuss the best places for the hunt for signs of life: the surface or inside Martian caves?

So if you're a Mars fan or a casual space aficionado, join us today at 1:30 p.m. EDT to get a detailed look at NASA's Viking Mars landings and their lasting impact on Martian exploration.