From a Bunny Hop to a Natural Walk
The enduring images of the Apollo program are of human giants bouncing awkwardly across the lunar surface. While heroic, their movements were severely restricted by stiff, bulky spacesuits that made bending, kneeling, or even walking a challenge. The suits were a marvel
of 1960s engineering, but their rigidity limited what astronauts could accomplish during their brief forays outside the lunar module. Studies have shown that navigating uneven and complex terrain requires significantly more physical effort, a problem compounded by a restrictive suit. For NASA's ambitious Artemis program, which aims to establish a long-term human presence on the Moon, the bunny hop simply wouldn't do. Astronauts needed the ability to walk, bend, and work with tools as naturally as possible.
A New Commercial Partnership for a New Suit
To solve this mobility challenge, NASA turned to a new model of development, partnering with private industry. The agency awarded contracts to develop the next generation of Extravehicular Mobility Units (EMUs), which are essentially personal spacecraft. For the critical task of walking on the Moon, Houston-based Axiom Space is developing the Axiom Extravehicular Mobility Unit, or AxEMU. This suit is being specifically designed for the harsh environment and scientific demands of the lunar South Pole, the target for upcoming Artemis landings. The partnership allows NASA to essentially rent the suits as a service, while Axiom retains ownership and can provide them to other future customers. While Collins Aerospace was also developing suits for the International Space Station (ISS), the company exited its contract in mid-2024, leaving Axiom to focus on both lunar and ISS suit development.
The Technology Behind the Flexibility
The key to the AxEMU's superior mobility lies in its joint design. Unlike the stiff layers of the Apollo suits, the new design incorporates innovative soft and hard joints with multiple bearings and low-friction slip layers. These advancements are focused on providing a greater range of motion at critical points like the waist, hips, knees, and ankles. This allows an astronaut to twist, bend down to pick up a rock, and walk with a more natural gait. The result is a suit that moves with the astronaut, rather than against them, dramatically reducing fatigue and increasing the efficiency of every moonwalk. Testing has been extensive, including underwater simulations in NASA's Neutral Buoyancy Laboratory to assess movement and functionality in a simulated lunar gravity environment.
More Than Just a Flexible Suit
While mobility is the headline feature, the AxEMU is a comprehensive upgrade. It's designed to be modular, allowing components to be swapped out for different missions, and to fit a much wider range of body types, opening up space exploration to more people. The suit offers greater protection against the harsh lunar environment, which includes extreme temperature swings and abrasive, electrostatically charged dust that can damage equipment. Axiom Space even collaborated with the Italian fashion house Prada on the design of the outer layers to help solve material and design challenges. Advanced life support systems, communications, and specialized tools, such as a 'Tool Boggan' sled, are all integrated to turn each astronaut into a mobile, efficient scientific explorer.
Unlocking the Future of Lunar Science
The impact of this new flexibility cannot be overstated. With the ability to walk more easily and cover more ground, Artemis astronauts can explore more complex and scientifically interesting terrain, like the steep slopes of craters. They can perform more intricate tasks, such as setting up experiments, collecting a wider variety of geological samples, and carrying out maintenance on future surface habitats. This leap in capability is foundational to the goals of the Artemis program, which successfully completed its first crewed fly-by of the moon with Artemis II in April 2026. As NASA prepares for Artemis III, a demonstration mission slated for 2027 to test lunar lander systems, these suits represent a critical piece of the puzzle. They are not just an upgrade; they are the key that will allow humanity to move from brief visits to truly living and working on the Moon.
