Why Walking on the Moon Is So Hard
The enduring footage of the Apollo moonwalks reveals a fundamental challenge: the spacesuits were incredibly restrictive. Essentially personalized spacecraft, these suits were pressurized to keep astronauts alive in a vacuum. However, this internal pressure
made every movement, from bending an elbow to kneeling, a fight against the suit itself. Astronauts described it as trying to move inside a stiff, inflated balloon. Compounding the issue was the moon's one-sixth gravity and its treacherous surface, covered in a fine, abrasive dust called regolith. The combination of a rigid suit, low gravity, and uneven terrain led to the famous “bunny hop,” a gait that was more about maintaining balance than efficient movement. These limitations restricted the scope and duration of scientific work astronauts could perform on the lunar surface.
A New Wardrobe for a New Generation
For the Artemis program, which aims to establish a sustained human presence on the Moon, NASA has turned to the private sector to engineer a solution. Instead of designing the suits in-house, the agency has awarded contracts to companies like Axiom Space and Collins Aerospace. Axiom Space is developing the Axiom Extravehicular Mobility Unit (AxEMU), the suit that Artemis III astronauts will wear on the lunar surface. Collins Aerospace, a long-time partner that has maintained suits for the International Space Station (ISS), is also developing a next-generation model that can be adapted for lunar missions. This commercial partnership approach is intended to drive innovation and efficiency, leveraging private sector expertise to build suits that are more capable and adaptable than their predecessors.
Engineered for Agility and Inclusivity
The key advancement in the new AxEMU suit is mobility. The design incorporates innovative joints and highly articulated bearings in the arms and legs, allowing astronauts a far greater range of motion. This means they will be able to walk more naturally, bend down to collect rock samples, and kneel to perform scientific tasks with an ease unimaginable in the Apollo era. Another critical upgrade is inclusivity. The Apollo suits were custom-tailored for a narrow range of male body types. The AxEMU, by contrast, is a modular and highly adjustable design intended to fit a broad spectrum of astronauts, accommodating at least 90 percent of both the male and female U.S. population. This ensures that a more diverse group of explorers can participate in lunar missions. The suit also features a rear-entry hatch, which makes it easier to put on and reduces the risk of shoulder injuries common with older suit designs.
High-Tech Materials and Surprising Partnerships
Building a suit for the Moon's south pole, a key target for Artemis missions, presents extreme challenges. Astronauts must be protected from temperatures that can swing from over 120°C in the sun to below -200°C in permanently shadowed craters. To tackle this, Axiom Space entered a surprising partnership with Italian luxury fashion house Prada. Leveraging Prada's expertise in advanced composite materials, the collaboration helped develop the suit's outer layer, which provides thermal insulation and protection against radiation and abrasive lunar dust. The suits also integrate modern technology, including high-definition cameras and lighting systems in the helmet, which are essential for operating in the dark conditions of shadowed craters. These advancements are designed to allow for spacewalks lasting eight hours or more, significantly extending the potential for scientific discovery.
More Than a Suit, It's an Exploration Platform
While the enhanced flexibility is a headline feature, the new suits represent a fundamental shift in how humanity will explore other worlds. Increased mobility means astronauts can cover more ground, carry more sophisticated tools, and perform more complex experiments. The new designs are also more durable and easier to maintain, a crucial factor for long-duration missions and establishing a sustainable base on the Moon. Collins Aerospace is focusing on modularity, allowing suits to be adapted for different environments, from low-Earth orbit to the Moon and eventually Mars. Although some former astronauts have noted that the new suits are heavier and still present mobility challenges, they are widely seen as a major improvement over previous designs. This new generation of personal spacecraft is a critical enabling technology, paving the way for a more ambitious and scientifically productive era of human space exploration.
