Picture this: Humans are gearing up to walk on the Moon again after more than half a century, and their first steps are happening in a massive underwater playground right here on Earth. It's thrilling, isn't it? But here's where it gets controversial – is investing billions in lunar adventures worth it when we have so many pressing challenges on our own planet? Dive into this fascinating world of astronaut training, and you might just rethink the future of space exploration.
When preparing for Moon missions, NASA's astronauts don't leap straight onto the lunar terrain; instead, they kick off their rehearsals deep underwater. For years, the agency's Neutral Buoyancy Laboratory (NBL) has served as the top training spot for simulating the weightlessness of space. This huge facility, filled with 6.2 million gallons of water, helps astronauts practice movements, fix problems, and work in conditions that mimic microgravity – that's the feeling of floating freely in space, where everything from your vision to your body adapts in unique ways due to the lack of gravity's pull. Inside this watery wonder, crews rehearse a wide array of tasks, from repairing the International Space Station to tackling intricate Moon surface operations.
And this is the part most people miss – the technology behind these suits is evolving dramatically, potentially sparking debates on whether private companies should lead the charge in space gear. With the Artemis program approaching, astronauts are now suiting up in an innovative design: the Axiom Extravehicular Mobility Unit, or AxEMU, created by Axiom Space to enable the first human Moon walks since the Apollo era.
So, what exactly is the AxEMU? Think of it as a significant leap forward from the old Apollo suits and even the ones used on the ISS today. This new gear boosts mobility, ensuring astronauts can move more naturally, fits a broader variety of body shapes and sizes for better inclusivity, includes advanced life-support systems to keep crews safe longer, and comes equipped with enhanced tools for conducting science on the Moon's rugged surface. Since Artemis explorers will need to navigate bumpy landscapes, gather samples, and endure extreme temperatures and lighting for hours on end, practicing with the AxEMU well in advance is crucial. At the NBL, astronauts wear weighted replicas of the suit while submerged, letting teams test how well they can maneuver, use their hands, see clearly, and perform overall – it's like a full dress rehearsal underwater.
Where does all this action unfold? This striking photo was captured at the NBL located at NASA's Johnson Space Center in Houston, the hub of astronaut training.
Why should we be amazed? In September 2025, NASA achieved a milestone with the first dual-suit test using the AxEMU. Astronauts Loral O'Hara and Stan Love wore two complete AxEMU suits at once, marking the inaugural time these suits were deployed together in a real-world simulation. This experiment evaluated how astronauts collaborate on tasks in full gear, how their life-support systems function in sync, and how the NBL setup supports comprehensive Artemis prep. O'Hara and Love simulated lunar duties, such as picking up rocks, dodging obstacles, and teaming up side by side, just as they would on the Moon. The success proved that the facility, support tools, and training methods are primed for the next exciting chapter of Artemis.
But here's the controversial twist – some argue that with rising costs and global issues like climate change, are these Moon dreams a luxury we can't afford, or a vital step toward humanity's expansion? What do you think: Should we prioritize space exploration over Earth's immediate needs? Share your thoughts in the comments below – do you agree, disagree, or have a counterpoint?
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Want to learn more? You can explore NASA's Artemis program and other Moon missions for deeper insights.
Kenna Hughes-Castleberry is the Content Manager at Space.com. Formerly, she was the Science Communicator at JILA, a physics research institute. Kenna is also a freelance science journalist. Her beats include quantum technology, AI, animal intelligence, corvids, and cephalopods.
