On a world with no air to hold warmth and no atmosphere to soften the sun, people who one day live on the Moon will need shelter that quietly keeps them alive through days that scorch and nights that freeze. A team at the University of Pennsylvania has looked at one of the oldest and humblest materials of the space age, thin layered Mylar, and found that the answer lies not in the thinnest possible sheet but in a middle path that resists both heat and the wear of human hands. It is a small step, reported in a scientific journal, toward the larger human ambition of staying on another world.
Layered Mylar Could Shield Future Moon Habitats From Extreme Lunar Temperature Swings
Astronauts will inevitably have little accidents where they bump into them.
Mark
Why Mylar? What problem is this actually solving?
Mimi
A habitat on the Moon faces swings from about 127 degrees Celsius in sunlight to roughly minus 238 or colder in shade. Insulation has to blunt that, and it also has to stay flexible and survive handling.
Luke
Worth noting that this is lab testing under vacuum and varied temperatures, not a habitat in place on the Moon.
Mark
What surprised the researchers?
Mimi
They expected the thinnest sheets, 2.5 micrometers stacked 400 layers deep, to do best. Instead the 5 and 12.5 micrometer stacks insulated better.
Mark
Why would thinner be worse?
Mimi
In the thin sheets, microparticles touched more and carried heat across. In the thicker ones they touched less, so less heat moved through.
Luke
That's the researchers' explanation. The reporting doesn't give us measured insulation values, so I can't say how large the gap is.
Mark
And the durability part?
Mimi
The stacks took pressure equal to 200 pounds on a fingertip-sized area and held up better than expected. Bargatin's point was that astronauts will bump into things.
Luke
Resilience beat expectations, but we don't know how it compares with other insulation, or how it behaves over years of lunar thermal cycling.
Mark
So where does it go from here?
Mimi
NASA wants a lasting presence near the south pole, so durable insulation matters. This study is one piece of that, not an answer yet.
Der Puls
- Lunar surface temperatures swing from scorching daylight near 127°C to brutal shadowed cold near minus 238°C, leaving no margin for error in a habitat's walls.
- The researchers expected the thinnest Mylar layers to win, but the results overturned that assumption and pointed instead to medium-thickness sheets.
- Testing under vacuum and crushing pressure exposed how fragile insulation can be, and the stacks held up better than the team anticipated.
- A researcher warns that astronauts will inevitably bump and handle their gear, so durability is no luxury but a requirement for long-term living.
- NASA's push toward a permanent south pole presence raises the stakes, and this study offers a tested starting point rather than a finished solution.
On a world with no air to hold warmth and no atmosphere to soften the sun, people who one day live on the Moon will need shelter that quietly keeps them alive through days that scorch and nights that freeze. A team at the University of Pennsylvania has looked at one of the oldest and humblest materials of the space age, thin layered Mylar, and found that the answer lies not in the thinnest possible sheet but in a middle path that resists both heat and the wear of human hands. It is a small step, reported in a scientific journal, toward the larger human ambition of staying on another world.
A team at the University of Pennsylvania set out to test whether stacks of thin Mylar could protect a lunar habitat from the Moon's extreme temperatures. On the surface, sunlight can heat the ground to between 70 and 127 degrees Celsius, while shadow can plunge it below minus 238. Any shelter there must hold steady temperatures and also survive being moved, compressed, and expanded.
The researchers tested three thicknesses of Mylar, from 2.5 to 12.5 micrometers, stacked in densities from 80 to 400 layers per millimeter. Each stack faced vacuum conditions, wide temperature ranges, and heavy pressure. The team had expected the thinnest sheets to insulate best. Instead, the medium 5-micrometer and thicker 12.5-micrometer stacks performed better. In thinner sheets, the microparticles touched more and carried heat through, while in the thicker layers they touched less, and the insulation held. The stacks also proved more resilient than the researchers had predicted.
Co-author Dr. Igor Bargatin noted that astronauts will inevitably bump into their equipment, so tough materials that last are essential for long-term habitation. The work comes as NASA aims to return humans to the Moon and build a lasting presence near the south pole, where water ice sits in shadowed craters. Whether layered Mylar becomes part of those habitats remains uncertain, but the study gives engineers a tested place to begin.
A team at the University of Pennsylvania has tested a way to keep a lunar habitat from being cooked or frozen: stacks of Mylar, layered thin and pressed tight. The results appear in ACS Applied Materials & Interfaces, and they came out differently than the researchers expected.
The problem is easy to state. Living on the Moon, whether for trained astronauts or eventually ordinary civilians, means holding a stable temperature inside a structure that sits in a brutal environment. In sunlight the lunar surface reaches between 70 and 127 degrees Celsius (158 to 260 Fahrenheit). In shade it drops to between minus 238 and minus 247 degrees Celsius (minus 396 to minus 413 Fahrenheit). A lunar day lasts 29.5 Earth days, split roughly into continuous daylight and continuous night. Insulation also has to survive being moved, handled, compressed and expanded, which makes flexibility as important as thermal performance.
The Penn researchers set out to fill a gap in knowledge about materials that can protect people while withstanding long-term wear in that setting. Their approach was layered Mylar sheets built to work in a vacuum and still flex enough for extended use.
They tested three sheet thicknesses: 2.5 micrometers, 5 micrometers and 12.5 micrometers. Layer density ran from 80 to 400 layers per millimeter. The 2.5 micrometer sheets were stacked at 400 layers, the 5 micrometer sheets at 200 and the 12.5 micrometer sheets at 80. Each stack went through a series of demanding tests under vacuum and across a wide range of temperatures. That included pressure equal to 200 pounds on an area the size of a fingertip.
The outcome surprised the team. They had hypothesized that the thinnest layers would perform best, but the medium (5 micrometer) and thicker (12.5 micrometer) stacks came out ahead. According to the findings, microparticles in the thinner sheets made greater contact with one another, which spread heat more readily and made the stack a poorer insulator. In the medium and thick layers, those particles touched less, so the stacks insulated better. The researchers also found the stacks more resilient than they had anticipated.
Dr. Igor Bargatin, an associate professor of mechanical engineering and applied mechanics at Penn and a co-author, tied that durability to daily life in a habitat. You could use these stacks to insulate a lunar habitation, he said, but astronauts will inevitably have little accidents where they bump into them. For long-term habitation, he added, tough materials that last long enough are essential.
The work arrives as NASA plans to return humans to the Moon for the first time since 1972, with a longer-term goal of a permanent presence on the surface. The agency is targeting the lunar south pole region, where certain craters hold large deposits of water ice. Staying there for long periods depends on technologies that let people live and work through the temperature extremes.
Whether layered Mylar ends up insulating Moon habitats in the coming years and decades remains to be seen. For now, the study offers a tested starting point: mid-thickness sheets that insulate well and hold up under abuse.
Bemerkenswerte Zitate
You could use these stacks to insulate a lunar habitation, but astronauts will inevitably have little accidents where they bump into them.— Dr. Igor Bargatin, associate professor, University of Pennsylvania
Möchten Sie die ganze Geschichte?
Das Original lesen bei Universe Today ↗
Science & Space