February 11, 2026

SpaceX Super Heavy Booster Passes Four-Day Cryoproof Test

Ars Technica Tech
SpaceX Starship Super Heavy spaceflight
SpaceX has achieved a significant engineering milestone as its next-generation Super Heavy booster successfully endured four continuous days of cryogenic proof testing. Cryoproof testing involves filling the rocket's tanks with super-cold propellant or a cryogenic fluid to verify that the structure can withstand the extreme temperatures and pressures it will face during actual launches.

The successful completion of this extended test campaign demonstrates the structural soundness of the updated booster design, which incorporates improvements learned from previous Starship test flights. The Super Heavy booster serves as the first stage of SpaceX's fully reusable Starship launch system, the most powerful rocket ever built.

This achievement clears a critical path toward upcoming Starship missions, as SpaceX continues its rapid development cadence in pursuit of NASA lunar missions, satellite deployment, and the company's long-term Mars ambitions.
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