Whose Job Is It to Keep Astronauts Alive? The 'Deep Space Lifeline' Tested by Artemis II
Artemis II has taken flight. The moment when humanity headed toward the moon for the first time in 54 years was watched live by millions around the world—that excitement is still fresh in our memories, but I would like to turn our attention to another story that was unfolding behind the launch footage.
Just how much technology and decision-making is stacked up to ensure that four astronauts return safely? This Artemis II mission is a 'non-landing mission.' While it sounds simple to say it is just circling the moon and coming back, those 10 days are positioned as a test of the life support systems that will sustain future crewed lunar landings and even trips to Mars.
I previously summarized the launch of Artemis II and its expansion into the lunar business in this article.
Today, as a follow-up, I will delve into the less-discussed theme of 'keeping people alive in space.'
Spacesuits were 'wearable spaceships'
As Stanford University materials scientist Debbie Senesky points out, spacesuits are no longer just 'clothes.' They must maintain air pressure around the body, block radiation, be flame-resistant, and yet have enough flexibility to allow the hands to move freely. The large, clunky suits of the Apollo era symbolized a 'protect at all costs' philosophy, but now there is a shift toward forms that fit the body more closely, anticipating complex work on the lunar surface.
There is a problem that is not often discussed: 'laundry.' There are no washing machines on a spacecraft. You can manage for 10 days, but when you consider long-term stays at a lunar base or Mars missions lasting several years, 'how to keep clothes clean' becomes a serious engineering problem. The reason why waterless cleaning technologies and optical sterilization processes are attracting attention is in anticipation of environments where water is a precious resource.
The 'weight' of food is a matter of life and death
The topic of food is also completely different from our sense of it on Earth. The supplies brought into space translate into fuel costs down to the gram. Therefore, space food requires a balance of nutritional density and weight density, and it is dehydrated, compressed, and vitamin-fortified, then reconstituted with water to be eaten.
Business eyes are turning toward this. The technology accumulated to create 'things that can be eaten in space' can be diverted to emergency rations, long-term preserved foods, and even special nutritional foods for home medical care. The development race for space food is quietly beginning to ripple out into the food industry on Earth.
Fighting the sun, outside the Earth's magnetosphere
There is one more risk that is hard to see but serious: radiation.
On the International Space Station, which flies in low Earth orbit, the Earth's magnetosphere provides a significant degree of protection. However, a spacecraft heading to the moon loses almost all of that protection. If exposed to charged particles flying at high speeds from the sun—a phenomenon called a 'solar particle event'—it could, in the worst case, lead to a lethal dose of radiation.
It is known that between the launches of Apollo 16 and 17 in 1972, one of the largest solar particle events in history occurred. It sends a chill down my spine to think about what would have happened if they had been in flight. That was a stroke of accidental luck.
For Artemis II, NASA and NOAA have established a system to monitor solar activity 24 hours a day and judge the safety of the crew in real time. Also, taking advantage of the fact that the Mars rover Perseverance is currently on the other side of the sun, they are performing quite interesting operations, such as predicting the movement of sunspots that cannot be seen from Earth.
This article is also helpful regarding the risks of solar storms and Artemis II.
https://phys.org/news/2026-04-solar-storm-derail-artemis-ii.html
In preparation for a possible solar storm, astronauts are also training to create 'temporary shielding walls' by stacking cargo inside the cabin in areas with high radiation. It is interesting that an analog idea—slowing down particles with mass—is functioning on the front lines.
Technology to stop the body from 'breaking down'
Long-term microgravity environments steadily erode bones and muscles. On the International Space Station, astronauts are required to exercise for two hours every day, but even then, signs of physical decline are seen when they return to Earth.
The E4D (European Enhanced Exploration Exercise Device) currently being developed by ESA is one answer to this problem. With a compact design capable of handling over 100 types of exercises, it also uses camera-based motion capture to automatically correct posture. It is scheduled to be delivered to the ISS in April 2026 on the epsilon mission, which will be crewed by ESA astronaut Sophie Adenot. Because space constraints will be even stricter on the future lunar orbital station (Lunar Gateway), the design philosophy of 'how small and multifunctional can we make it' is being put to the test.
The development of exercise equipment for space is directly linked to knowledge in terrestrial rehabilitation equipment and sports science. Technology development for space and Earth is progressing through mutual, bidirectional influence.
A 'cautious industry' is beginning to change
The space industry has historically had a conservative culture. There is a deeply rooted concept called 'flight heritage'—the desire not to change materials or designs that have already flown and succeeded—and new materials cannot be adopted without passing an enormous amount of verification, including structural, impact, radiation, and outgassing tests.
However, hearing about research into building lunar habitats using graphene insulation or mushroom-derived composite materials suggests that this barrier is beginning to shift, little by little. Artemis II is not just a 'test flight,' but a mission that paves the way for next-generation materials to be brought into space in earnest.
Following this single flight, a massive market for lunar base construction and long-term crewed flights to Mars will begin to move. 'Technology to keep people alive' will become one of the most important themes in space business from here on out.
Reference Articles
o What it takes to keep astronauts safe in deep space (April 1, 2026)
https://phys.org/news/2026-04-astronauts-safe-deep-space.html
o Artemis II has taken off—surpassing 54 years of silence, humanity heads to the moon once again (April 2, 2026)
o Could a solar storm derail the Artemis II mission? (April 1, 2026)
https://phys.org/news/2026-04-solar-storm-derail-artemis-ii.html
o To protect Artemis II Astronauts, NASA experts keep their eyes on the sun (March 16, 2026)
https://phys.org/news/2026-03-artemis-ii-astronauts-nasa-experts.html
o Improving astronaut fitness for deep space missions (January 19, 2026)
https://phys.org/news/2026-01-astronaut-deep-space-missions.html
o 5 reasons why the Artemis II mission is a big deal (April 1, 2026)
https://phys.org/news/2026-04-artemis-ii-mission-big.html