RE: McNol’s Whale Theory15 Feb 2026 16:03
The whale is elon musk.
Alpine skiing 2026
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Yes, SpaceX still requires helium for its current operations, though it is actively working to eliminate its use in future spacecraft to ensure long-term sustainability on missions to Mars.
Here is how SpaceX uses helium and where they are moving away from it:
Current Use in Falcon 9
The Falcon 9 relies heavily on helium for several critical functions:
Tank Pressurisation: As the rocket consumes fuel (RP-1) and liquid oxygen (LOX), gaseous helium is pumped into the tanks to fill the empty space (the "ullage"). This maintains the structural integrity of the rocket and ensures a steady flow of propellant to the engines.
Pneumatic Systems: Helium is used to actuate valves and deploy the landing legs on the first-stage booster.
Engine Spin-Up & Purging: It provides the initial pressure needed to spin up the turbopumps before ignition and is used to purge fuel lines of residual propellants.
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Transitioning Away with Starship
SpaceX's next-generation Starship is designed to be "helium-free" for its primary systems, primarily because helium is not naturally available on Mars.
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Autogenous Pressurisation: Instead of helium, Starship uses autogenous pressurisation—heating a small amount of its own liquid methane and oxygen into gas to pressurise its tanks.
Current Testing: During early Starship test flights, SpaceX has occasionally reverted to using helium for specific header tanks or engine purges to simplify the engineering during the development phase. However, the goal remains a fully self-sustaining system for deep-space travel.
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Why SpaceX Wants to Stop Using It
Cost: Helium is extremely expensive, sometimes costing more than the actual rocket fuel.
Scarcity: It is a finite, non-renewable resource on Earth.
Technical Risks: Helium is notoriously difficult to contain; its tiny atoms leak easily, and helium system failures have caused numerous launch scrubs and even a pad explosion in 2016.
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Would you like to know more about the autogenous pressurisation technology SpaceX is developing to replace helium?
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SpaceX is expected to use helium for at least the next 8 to 10 years, primarily to support its active Falcon 9 and Falcon Heavy launch manifests.
While SpaceX's long-term goal is to eliminate helium entirely, its current usage is split between two different paths:
1. Falcon 9 & Falcon Heavy (Ongoing Use)
These rockets are fundamentally designed around helium-pressurised systems and cannot fly without it.
Operational Lifetime: In November 2024, SpaceX executives stated they expect to continue selling and flying Falcon 9 missions for approximately 8 more years.
Transition Indicator: Sales of new Falcon 9 launches are expected to cease about 24 months before the