NASA plans to conduct the first controlled fire experiment on the Moon in late 2026. The mission, named Flammability of Materials on the Moon (FM2), will ignite solid fuel samples on the lunar surface. This groundbreaking test aims to understand how flames behave in the Moon's unique one-sixth gravity, which is crucial for ensuring the safety of astronauts on future Artemis missions and long-term lunar habitats.[fireandsafetyjournalamericas+4]
Understanding Lunar Fire Behavior
The FM2 experiment will burn four solid fuel samples one at a time inside a sealed chamber. This autonomous payload will replicate atmospheric conditions expected in future lunar habitats and spacecraft. Cameras will record details like flame size, color, intensity, and how fast the fire spreads. Onboard sensors will measure oxygen, carbon dioxide, and flame and fuel temperatures.The entire hardware package measures about 28.5 by 28.5 by 38.5 centimeters and weighs approximately 25 kilograms.[fireandsafetyjournalamericas+4]
Scientists believe materials considered safe on Earth might become more flammable in reduced gravity environments like the Moon.On Earth, hot gases from a flame rise quickly, drawing in fresh oxygen. This airflow can sometimes even extinguish a fire, a process called "blowoff."In lunar gravity, however, this airflow is much weaker. This could allow combustion reactions to continue more efficiently, potentially making certain materials easier to ignite or causing flames to spread in unexpected ways.[fireandsafetyjournalamericas+9]
Paul Ferkul, the lead researcher on FM2, emphasized the importance of this work. "You can have fires on a space station, and we're interested in figuring out the conditions in terms of the flow environment where the fire could occur," Ferkul said.He added that identifying these conditions helps determine measures to minimize fire risks.[wbal+1]
Why the Moon is Different
The Moon's gravity is roughly one-sixth that of Earth's.This partial gravity environment is difficult to accurately recreate for long periods in Earth-based laboratories.Previous fire experiments by NASA have mostly occurred in microgravity aboard the International Space Station (ISS) or inside uncrewed Cygnus cargo spacecraft.While these "Saffire" experiments provided valuable data on fire in near-zero gravity, they do not fully represent lunar conditions.[fireandsafetyjournalamericas+17]
Research from the ISS, parabolic flights, and drop tower experiments suggests that some materials may ignite at lower oxygen concentrations in partial gravity than on Earth.This is especially critical because future lunar habitats are expected to operate at lower atmospheric pressure but with higher oxygen concentrations. These conditions can significantly increase flammability risks.Understanding these dynamics is a vital step in reducing risks as NASA and its partners work toward a sustained human presence beyond Earth.[fireandsafetyjournalamericas+7]
Informing Future Artemis Missions
The FM2 mission will launch aboard a Commercial Lunar Payload Services (CLPS) lander.Its findings will directly inform fire safety standards for upcoming Artemis missions, which aim to return humans to the Moon and establish a long-term presence.This includes designing safer lunar vehicles, habitats, and even spacesuits.[sciencealert+15]
NASA's current material certification methods, such as NASA-STD-6001B, are largely based on tests conducted under Earth's gravity.These tests assess if materials are suitable for spacecraft use, often failing them if flames spread beyond a six-inch limit or produce burning debris.However, scientists say these Earth-based tests may not fully reflect how materials will behave on the Moon.[fireandsafetyjournalamericas+7]
The data collected by FM2 will help bridge the gap between theoretical models of fire behavior in partial gravity and actual observations.This will allow researchers to refine existing material screening methods, ensuring they are appropriate for the unique challenges of lunar exploration.The experiment is considered a critical step in determining material flammability and safety for future missions, including potential human missions to Mars.[sciencealert+7]
