Liquid methane has become the propellant of choice for the next generation of heavy-lift rockets, yet the safety frameworks governing their launch sites were built around older fuels. NASA and the U.S. Space Force are now conducting live explosive yield tests to close that gap.
According to the announcement, the agencies need hard data on how a catastrophically failing methalox rocket — one burning liquid methane and liquid oxygen — produces blast waves, debris, and thermal effects that differ from those of kerosene- or hydrogen-fueled vehicles. The methodology is direct: propellants are loaded into test articles at a remote site, the barrier between them is deliberately ruptured to simulate a worst-case failure, and instruments distributed across the test field measure blast intensity at prescribed distances. High-speed cameras track debris velocity and thermal output simultaneously.
“We put fuel in a rocket, blow it up in a remote location, and measure how big the boom is,” said Jason Hopper, deputy manager for the methalox assessment project at NASA‘s Stennis Space Center.
The practical stakes are concrete. Federal safety regulations require blast danger areas around launch pads to be evacuated during fueling operations, and the correct sizing of those areas depends on accurate explosive yield models. With methalox launch infrastructure now operational or under construction at Kennedy Space Center, Cape Canaveral Space Force Station, Vandenberg Space Force Base, and NASA‘s Wallops Flight Facility, and with some pads sitting as close as 1 to 2 miles apart, an oversized danger area at one pad can directly interrupt operations at another. Some companies have raised that concern explicitly in relation to SpaceX‘s Starship, which is powered by 39 Raptor engines — each producing more than half a million pounds of thrust — making it the largest methalox vehicle currently flying.
Col. Brian Chatman, commander of the Eastern Range at Cape Canaveral Space Force Station, said at a reporters roundtable last year that existing analysis is insufficient to determine how far danger areas could safely be reduced: “We just don’t have the analysis on those to be able to say, ‘Hey, from a testing perspective, how small can we reduce the BDA and be safe?'”
Methane’s rise as a rocket propellant has been roughly 15 years in the making. Its advantages over kerosene include significantly less residue buildup in engines — a meaningful factor for reusability — and over liquid hydrogen, it is easier to handle and stored at warmer cryogenic temperatures, between minus 260 and minus 297 degrees Fahrenheit, compared to hydrogen’s minus 423 degrees Fahrenheit. A Chinese rocket became the first methane-fueled vehicle to reach orbit in 2023. In the United States, Rocket Lab, Stoke Space, and Relativity Space are developing methane engines alongside SpaceX and Blue Origin, whose BE-4 engine powers both New Glenn and United Launch Alliance‘s Vulcan.
Hopper noted the rarity and long-term value of the work: “This type of testing only comes around once every few decades. With so many rockets launching now, this will contribute to public safety.”
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